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227-607: To date, the only use of nuclear weapons in armed conflict occurred in 1945 with the American atomic bombings of Hiroshima and Nagasaki . On August 6, 1945, a uranium gun-type device (code name " Little Boy ") was detonated over the Japanese city of Hiroshima . Three days later, on August 9, a plutonium implosion-type device (code name " Fat Man ") was detonated over the Japanese city of Nagasaki . Together, these two bombings resulted in

454-515: A credible minimum deterrence . Commodore Tim Hare , former Director of Nuclear Policy at the British Ministry of Defence , has described "sub-strategic use" as offering the Government "an extra option in the escalatory process before it goes for an all-out strategic strike which would deliver unacceptable damage". However, this sub-strategic capacity has been criticized as potentially increasing

681-450: A limited nuclear war (sometimes attack or exchange ), refers to the controlled use of nuclear weapons, whereby the implicit threat exists that a nation can still escalate their use of nuclear weapons. For example, using a small number of nuclear weapons against strictly military targets could be escalated through increasing the number of weapons used, or escalated through the selection of different targets. Limited attacks are thought to be

908-549: A Fat Man was dropped on Nagasaki. Over the next two to four months, the effects of the atomic bombings killed 90,000 to 166,000 people in Hiroshima and 60,000 to 80,000 people in Nagasaki; roughly half occurred on the first day. For months afterward, many people continued to die from the effects of burns, radiation sickness , and other injuries, compounded by illness and malnutrition. Despite Hiroshima's sizable military garrison, most of

1135-767: A German rebuilding effort set forth by western European countries in 1948, the US, Britain and France spearheaded the establishment of the Federal Republic of Germany from the three Western zones of occupation in April 1949. The Soviet Union proclaimed its zone of occupation in Germany the German Democratic Republic that October. Media in the Eastern Bloc was an organ of the state , completely reliant on and subservient to

1362-483: A culture where use of these weapons is more acceptable and therefore is increasing the risk of war, as these modern weapons do not possess the same psychological deterrent value as the large Cold-War era, multi-megaton warheads. In many ways, this present change in the balance of terror can be seen as the complete embracement of the switch from the 1950s Eisenhower doctrine of " massive retaliation " to one of " flexible response ", which has been growing in importance in

1589-628: A greater loss of life; according to critics, the bombings were unnecessary for the war's end and were a war crime , raising moral and ethical implications. In 1945, the Pacific War between the Empire of Japan and the Allies entered its fourth year. Most Japanese military units fought fiercely, ensuring that the Allied victory would come at an enormous cost. The 1.25 million battle casualties incurred in total by

1816-450: A large area using conventional explosives, called dirty bombs . The detonation of a "dirty bomb" would not cause a nuclear explosion, nor would it release enough radiation to kill or injure a large number of people. However, it could cause severe disruption and require potentially very costly decontamination procedures and increased spending on security measures. Radioactive materials can also be used for targeted assassinations. For example,

2043-490: A large fraction of the city may be destroyed. The Emperor's palace in Tokyo has a greater fame than any other target but is of least strategic value." Edwin O. Reischauer , a Japan expert for the U.S. Army Intelligence Service , was incorrectly said to have prevented the bombing of Kyoto. In his autobiography, Reischauer specifically refuted this claim: ... the only person deserving credit for saving Kyoto from destruction

2270-423: A large war industry, manufacturing parts for planes and boats, for bombs, rifles, and handguns. The center of the city contained several reinforced concrete buildings. Outside the center, the area was congested by a dense collection of small timber workshops set among Japanese houses. A few larger industrial plants lay near the outskirts of the city. The houses were constructed of timber with tile roofs, and many of

2497-513: A large-scale, "combined nuclear and conventional" war. In accordance with their doctrine, the Soviet Union conducted large-scale military exercises to explore the possibility of defensive and offensive warfare during a nuclear war . The exercise, under the code name of " Snowball ", involved the detonation of a nuclear bomb about twice as powerful as that which fell on Nagasaki and an army of approximately 45,000 soldiers on maneuvers through

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2724-734: A leaflet listing 11 or 12 cities targeted for firebombing; a total of 33 cities listed. With the text of this leaflet reading in Japanese "...   we cannot promise that only these cities will be among those attacked   ..." Hiroshima was not listed. In 1943, the United States and the United Kingdom signed the Quebec Agreement , which stipulated that nuclear weapons would not be used against another country without mutual consent. Stimson therefore had to obtain British permission. A meeting of

2951-537: A leaflet. Leaflet texts were prepared by recent Japanese prisoners of war because they were thought to be the best choice "to appeal to their compatriots". In preparation for dropping an atomic bomb on Hiroshima, the Oppenheimer-led Scientific Panel of the Interim Committee decided against a demonstration bomb and against a special leaflet warning. Those decisions were implemented because of

3178-516: A limited number of missiles against an adversary as a means of conveying a political message, warning or demonstration of resolve". It is believed that all current nuclear weapons states possess tactical nuclear weapons, with the exception of the United Kingdom , which decommissioned its tactical warheads in 1998. However, the UK does possess scalable-yield strategic warheads, and this technology tends to blur

3405-510: A major propaganda effort began in 1949 was Radio Free Europe/Radio Liberty , dedicated to bringing about the peaceful demise of the communist system in the Eastern Bloc. Radio Free Europe attempted to achieve these goals by serving as a surrogate home radio station, an alternative to the controlled and party-dominated domestic press in the Soviet Bloc. Radio Free Europe was a product of some of

3632-525: A meeting with the President and commanders on 18 June 1945, General George C. Marshall stated that "there was reason to believe" casualties for the first 30 days would not exceed the price paid for Luzon . Additionally, with the Japanese position rendered "hopeless" by an invasion of their mainland, Marshall speculated that Soviet entry into the war might be "the decisive action" needed to finally "[leverage] them into capitulation." Marshall began contemplating

3859-429: A more credible response against attacks that do not justify all-out retaliation, such as an enemy's limited use of nuclear weapons. The second, a full-scale nuclear war , could consist of large numbers of nuclear weapons used in an attack aimed at an entire country, including military, economic, and civilian targets. Such an attack would almost certainly destroy the entire economic, social, and military infrastructure of

4086-626: A neutral Germany to prevent West Germany's incorporation into NATO, but his attempts were cut short after he was executed several months later during a Soviet power struggle. The events led to the establishment of the Bundeswehr , the West German military, in 1955. In 1949, CCP Chairman Mao Zedong 's People's Liberation Army defeated Chiang Kai-shek 's United States-backed Kuomintang (KMT) Nationalist Government in China. The KMT-controlled territory

4313-655: A new war". On 6 September 1946, James F. Byrnes delivered a speech in Germany repudiating the Morgenthau Plan (a proposal to partition and de-industrialize post-war Germany) and warning the Soviets that the US intended to maintain a military presence in Europe indefinitely. As Byrnes stated a month later, "The nub of our program was to win the German people ... it was a battle between us and Russia over minds ..." In December,

4540-431: A nuclear war. Therefore, they expected a large-scale nuclear exchange, followed by a "conventional war" which itself would involve heavy use of tactical nuclear weapons . American doctrine rather assumed that Soviet doctrine was similar, with the mutual in mutually assured destruction necessarily requiring that the other side see things in much the same way, rather than believing—as the Soviets did—that they could fight

4767-549: A peak of over 381,000 earlier in the war but prior to the atomic bombing, the population had steadily decreased because of a systematic evacuation ordered by the Japanese government . At the time of the attack, the population was approximately 340,000–350,000. Residents wondered why Hiroshima had been spared destruction by firebombing. Some speculated that the city was to be saved for U.S. occupation headquarters, others thought perhaps their relatives in Hawaii and California had petitioned

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4994-572: A plan envisioning an economically self-sufficient Germany, including a detailed accounting of the industrial plants, goods and infrastructure already taken by the Soviets. In June 1947, in accordance with the Truman Doctrine , the United States enacted the Marshall Plan , a pledge of economic assistance for all European countries willing to participate, including the Soviet Union. Under the plan, which President Harry S. Truman signed on 3 April 1948,

5221-573: A press conference that the Potsdam Declaration was no more than a rehash ( yakinaoshi ) of the Cairo Declaration , that the government intended to ignore it ( mokusatsu , "kill by silence"), and that Japan would fight to the end. The statement was taken by both Japanese and foreign papers as a clear rejection of the declaration. Emperor Hirohito, who was waiting for a Soviet reply to non-committal Japanese peace feelers, made no move to change

5448-470: A program to update the bomber fleet to one that was all-jet. During the early 1950s the B-47 Stratojet and B-52 Stratofortress were introduced, providing the ability to bomb the Soviet Union more easily. Before the development of a capable strategic missile force in the Soviet Union, much of the war-fighting doctrine held by western nations revolved around using a large number of smaller nuclear weapons in

5675-601: A qualitative advantage over the Soviet numerical supremacy in conventional weapons. Several scares about the increasing ability of the Soviet Union's strategic bomber forces surfaced during the 1950s. The defensive response by the United States was to deploy a fairly strong "layered defense" consisting of interceptor aircraft and anti-aircraft missiles , like the Nike , and guns, like the M51 Skysweeper , near larger cities. However, this

5902-498: A request from Winston Churchill that Britain be represented when the atomic bomb was dropped. William Penney and Group Captain Leonard Cheshire were sent to Tinian, but LeMay would not let them accompany the mission. The Little Boy bomb, except for the uranium payload, was ready at the beginning of May 1945. There were two uranium-235 components, a hollow cylindrical projectile and a cylindrical target insert. The projectile

6129-613: A secret 1950 document, the National Security Council proposed reinforcing pro-Western alliance systems and quadrupling spending on defense. Truman, under the influence of advisor Paul Nitze , saw containment as implying complete rollback of Soviet influence in all its forms. United States officials moved to expand this version of containment into Asia , Africa , and Latin America , in order to counter revolutionary nationalist movements, often led by communist parties financed by

6356-540: A series of landings by the U.S. Sixth Army intended to capture the southern third of the southernmost main Japanese island, Kyūshū . This was to be followed in March 1946 by Operation Coronet , the capture of the Kantō Plain , near Tokyo on the main Japanese island of Honshū by the U.S. First , Eighth and Tenth Armies, as well as a Commonwealth Corps made up of Australian, British and Canadian divisions. The target date

6583-461: A series of raids on strategic targets in Japan. This effort failed to achieve the strategic objectives that its planners had intended, largely because of logistical problems, the bomber's mechanical difficulties, the vulnerability of Chinese staging bases, and the extreme range required to reach key Japanese cities. Brigadier General Haywood S. Hansell determined that Guam , Tinian , and Saipan in

6810-477: A source of intelligence. During the late 1970s and 1980s, the KGB perfected its use of espionage to sway and distort diplomacy. Active measures were "clandestine operations designed to further Soviet foreign policy goals," consisting of disinformation, forgeries, leaks to foreign media, and the channeling of aid to militant groups. Retired KGB Major General Oleg Kalugin , former head of Foreign Counter Intelligence for

7037-676: A study by the Joint War Plans Committee, drawing on the experience of the Battle of Leyte , estimated that Downfall would result in 132,500 to 220,000 U.S. casualties, with U.S. dead and missing in the range from 27,500 to 50,000. Secretary of War Henry L. Stimson commissioned his own study by Quincy Wright and William Shockley , who estimated the invading Allies would suffer between 1.7 and 4 million casualties, of whom between 400,000 and 800,000 would be dead, while Japanese fatalities would have been around 5 to 10 million. In

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7264-494: A tactical role. It is debatable whether such use could be considered "limited" however because it was believed that the United States would use its own strategic weapons (mainly bombers at the time) should the Soviet Union deploy any kind of nuclear weapon against civilian targets. Douglas MacArthur , an American general, was fired by President Harry Truman , partially because he persistently requested permission to use his own discretion in deciding whether to utilize atomic weapons on

7491-530: A unified and neutral Germany was undesirable, with Walter Bedell Smith telling General Eisenhower "in spite of our announced position, we really do not want nor intend to accept German unification on any terms that the Russians might agree to, even though they seem to meet most of our requirements." Shortly thereafter, Stalin instituted the Berlin Blockade (June 1948 – May 1949), one of the first major crises of

7718-449: A very short period of time. Such predictions usually include the breakdown of institutions, government, professional and commercial, vital to the continuation of civilization. The resulting loss of vital affordances (food, water and electricity production and distribution, medical and information services, etc.) would account for millions more deaths. More pessimistic predictions argue that a full-scale nuclear war could potentially bring about

7945-411: A war took place—others would be sure to follow over a period of decades, effectively rendering the planet uninhabitable in the same way that a "full-scale nuclear war" between superpowers would, only taking a much longer (and arguably more agonizing) path to the same result. Even the most optimistic predictions of the effects of a major nuclear exchange foresee the death of many millions of victims within

8172-476: A warhead to a target, a missile was much faster and more cost-effective than a bomber, and enjoyed a higher survivability due to the enormous difficulty of interception of the ICBMs (due to their high altitude and extreme speed). The Soviet Union could now afford to achieve nuclear parity with the United States in raw numbers, although for a time, they appeared to have chosen not to. Photos of Soviet missile sites set off

8399-579: A wave of panic in the U.S. military, something the launch of Sputnik would do for the American public a few months later. Politicians, notably then- U.S. Senator John F. Kennedy suggested that a " missile gap " existed between the Soviet Union and the United States. The US military gave missile development programs the highest national priority, and several spy aircraft and reconnaissance satellites were designed and deployed to observe Soviet progress. Atomic bombings of Hiroshima and Nagasaki Second Sino-Japanese War On 6 and 9 August 1945,

8626-622: Is Henry L. Stimson, the Secretary of War at the time, who had known and admired Kyoto ever since his honeymoon there several decades earlier. Extant sources show that while Stimson was personally familiar with Kyoto, this was the result of a visit decades after his marriage, not because he honeymooned there. On 30 May, Stimson asked Groves to remove Kyoto from the target list due to its historical, religious and cultural significance, but Groves pointed to its military and industrial significance. Stimson then approached President Harry S. Truman about

8853-431: Is a largely unknown and understudied factor in nuclear deterrence thinking, as states possessing nuclear weapons are susceptible to retaliation in kind, while sub- or trans-state actors may be less so. The collapse of the Soviet Union has given rise to the possibility that former Soviet nuclear weapons might become available on the black market (so-called 'loose nukes'). A number of other concerns have been expressed about

9080-416: Is such a size that a large part of the city could be extensively damaged. There are adjacent hills which are likely to produce a focusing effect which would considerably increase the blast damage. Due to rivers it is not a good incendiary target." The Target Committee stated that "It was agreed that psychological factors in the target selection were of great importance. Two aspects of this are (1) obtaining

9307-587: The Operation Meetinghouse raid on Tokyo . On the night of March 9–10, 1945, Operation Meetinghouse commenced and 334 Boeing B-29 Superfortress bombers took off to raid, with 279 of them dropping 1,665 tons of incendiaries and explosives on Tokyo . The bombing was meant to burn wooden buildings and indeed the bombing caused fire that created a 50 m/s wind, which is comparable to tornadoes. Each bomber carried 6 tons of bombs. A total of 381,300 bombs, which amount to 1,783 tons of bombs, were used in

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9534-551: The Baltic to Trieste in the Adriatic ". A week later, on 13 March, Stalin responded vigorously to the speech, saying Churchill could be compared to Adolf Hitler insofar as he advocated the racial superiority of English-speaking nations so that they could satisfy their hunger for world domination, and that such a declaration was "a call for war on the USSR." The Soviet leader also dismissed

9761-806: The Berlin Wall to prevent the citizens of East Berlin from fleeing to West Berlin , at the time part of United States-allied West Germany . Major crises of this phase included the Berlin Blockade of 1948–1949, the Chinese Communist Revolution of 1945–1949, the Korean War of 1950–1953, the Hungarian Revolution of 1956 and the Suez Crisis of that same year, the Berlin Crisis of 1961 ,

9988-653: The Boeing B-29 Superfortress , and deployed to Tinian in the Mariana Islands . The Allies called for the unconditional surrender of the Imperial Japanese armed forces in the Potsdam Declaration on 26 July 1945, the alternative being "prompt and utter destruction". The Japanese government ignored the ultimatum. The consent of the United Kingdom was obtained for the bombing, as was required by

10215-549: The Cold War . As long as the strategic American nuclear forces could overwhelm their Soviet counterparts, a Soviet pre-emptive strike could be averted. Moreover, the Soviet Union could not afford to build any reasonable counterforce, as the economic output of the United States was far larger than that of the Soviets, and they would be unable to achieve "nuclear parity". Soviet nuclear doctrine, however, did not match American nuclear doctrine. Soviet military planners assumed they could win

10442-542: The Cold War . In 1974, India , and in 1998, Pakistan , two countries that were openly hostile toward each other, developed nuclear weapons. Israel (1960s) and North Korea (2006) are also thought to have developed stocks of nuclear weapons, though it is not known how many. The Israeli government has never admitted nor denied having nuclear weapons, although it is known to have constructed the reactor and reprocessing plant necessary for building nuclear weapons. South Africa also manufactured several complete nuclear weapons in

10669-601: The Combined Policy Committee , which included one Canadian representative, was held at the Pentagon on 4 July 1945. Field Marshal Sir Henry Maitland Wilson announced that the British government concurred with the use of nuclear weapons against Japan, which would be officially recorded as a decision of the Combined Policy Committee. As the release of information to third parties was also controlled by

10896-852: The Cuban Missile Crisis of 1962, and the Vietnam War of 1964–1975. Both superpowers competed for influence in Latin America and the Middle East , and the decolonising states of Africa , Asia , and Oceania . Following the Cuban Missile Crisis, this phase of the Cold War saw the Sino-Soviet split . Between China and the Soviet Union's complicated relations within the Communist sphere, leading to

11123-837: The Eastern Bloc . Cominform faced an embarrassing setback the following June, when the Tito–Stalin split obliged its members to expel Yugoslavia, which remained communist but adopted a non-aligned position and began accepting financial aid from the US. Besides Berlin, the status of the city of Trieste was at issue. Until the break between Tito and Stalin, the Western powers and the Eastern bloc faced each other uncompromisingly. In addition to capitalism and communism, Italians and Slovenes, monarchists and republicans as well as war winners and losers often faced each other irreconcilably. The neutral buffer state Free Territory of Trieste , founded in 1947 with

11350-534: The Einstein–Szilard letter to Roosevelt in 1939. This prompted preliminary research in the United States in late 1939. Progress was slow until the arrival of the British MAUD Committee report in late 1941, which indicated that only 5 to 10 kilograms of isotopically -pure uranium-235 were needed for a bomb instead of tons of natural uranium and a neutron moderator like heavy water . Consequently,

11577-544: The Interim Committee was created by Stimson at the urging of leaders of the Manhattan Project and with the approval of Truman to advise on matters pertaining to nuclear technology . They agreed that the atomic bomb was to be used (1) against Japan at the earliest opportunity, (2) without special warning, and (3) on a "dual target" of military installation surrounded by other buildings susceptible to damage. During

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11804-503: The KGB and involved in its intelligence operations, adhered to Moscow's line, although dissent began to appear after 1956. Other critiques of the consensus policy came from anti-Vietnam War activists , the Campaign for Nuclear Disarmament , and the anti-nuclear movement . In early 1947, France, Britain and the United States unsuccessfully attempted to reach an agreement with the Soviet Union for

12031-506: The Kingdom of Greece in its civil war against Communist-led insurgents. In the same month, Stalin conducted the rigged 1947 Polish legislative election which constituted an open breach of the Yalta Agreement . The US government responded to this announcement by adopting a policy of containment , with the goal of stopping the spread of communism . Truman delivered a speech calling for

12258-512: The Mariana Islands would better serve as B-29 bases, but they were in Japanese hands. Strategies were shifted to accommodate the air war, and the islands were captured between June and August 1944. Air bases were developed, and B-29 operations commenced from the Marianas in October 1944. The XXI Bomber Command began missions against Japan on 18 November 1944. The early attempts to bomb Japan from

12485-717: The Marshall Plan in 1948 to assist in Western Europe's economic recovery, and founded the NATO military alliance in 1949 (which was matched by the Soviet-led Warsaw Pact in 1955). The Berlin Blockade took place, and Germany's occupation zones solidified into East and West Germany in 1949. The USSR tested its first nuclear weapon in August 1949, four years after the U.S.'s first test , thus starting an arms race. A major proxy war

12712-421: The Pacific theaters of the war. On July 26, 1945, the United States, the United Kingdom , and the Republic of China issued a Potsdam Declaration that called for the unconditional surrender of Japan. It stated that if Japan did not surrender, it would face "prompt and utter destruction". The Japanese government ignored this ultimatum, sending a message that they were not going to surrender. In response to

12939-446: The People's Republic of China in 1951 during the Korean War . Mao Zedong , China's communist leader, gave the impression that he would welcome a nuclear war with the capitalists because it would annihilate what he viewed as their imperialist system. Let us imagine how many people would die if war breaks out. There are 2.7 billion people in the world, and a third could be lost. If it is a little higher it could be half ... I say that if

13166-405: The Quebec Agreement , and orders were issued on 25 July by General Thomas Handy , the acting chief of staff of the United States Army , for atomic bombs to be used against Hiroshima, Kokura , Niigata , and Nagasaki. These targets were chosen because they were large urban areas that also held militarily significant facilities. On 6 August, a Little Boy was dropped on Hiroshima. Three days later,

13393-411: The Second World and was also tied to a network of authoritarian states. The Soviet Union had a command economy and installed similarly communist regimes its in satellites. United States involvement in regime change during the Cold War included support for anti-communist and right-wing dictatorships , governments, and uprisings across the world, while Soviet involvement in regime change included

13620-447: The Sino-Soviet border conflict , while France, a Western Bloc state, began to demand greater autonomy of action. The Warsaw Pact invasion of Czechoslovakia occurred to suppress the Prague Spring of 1968, while the United States experienced internal turmoil from the civil rights movement and opposition to United States involvement in the Vietnam War . In the 1960s–1970s, an international peace movement took root among citizens around

13847-491: The Soviet boycott of the Allied Control Council and its incapacitation, an event marking the beginning of the full-blown Cold War and the end of its prelude, as well as ending any hopes at the time for a single German government and leading to formation in 1949 of the Federal Republic of Germany and German Democratic Republic . The twin policies of the Truman Doctrine and the Marshall Plan led to billions in economic and military aid for Western Europe, Greece, and Turkey. With

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14074-416: The Soviet Union (USSR) and their respective allies, the Western Bloc and the Eastern Bloc , that started in 1947, two years after the end of World War II , and lasted until the fall of the Soviet Union in 1991. The term cold war is used because there was no direct fighting between the two superpowers , though each supported opposing sides in major regional conflicts known as proxy wars . Aside from

14301-399: The Three Non-Nuclear Principles , which forbade the nation from developing nuclear armaments. After the successful Trinity nuclear test July 16, 1945, which was the very first nuclear detonation, the Manhattan project lead manager J. Robert Oppenheimer recalled: We knew the world would not be the same. A few people laughed, a few people cried, and most people were silent. I remembered

14528-438: The Turkish Straits crisis and Black Sea border disputes were also a major factor in increasing tensions. In September, the Soviet side produced the Novikov telegram, sent by the Soviet ambassador to the US but commissioned and "co-authored" by Vyacheslav Molotov ; it portrayed the US as being in the grip of monopoly capitalists who were building up military capability "to prepare the conditions for winning world supremacy in

14755-415: The United Nations Security Council Resolution 82 and 83 backed the defense of South Korea, although the Soviets were then boycotting meetings in protest of the fact that Taiwan (Republic of China), not the People's Republic of China , held a permanent seat on the council. A UN force of sixteen countries faced North Korea, although 40 percent of troops were South Korean, and about 50 percent were from

14982-419: The United States Navy (and their aircraft) deployed various such weapons as bombs, rockets (guided and unguided), torpedoes, and depth charges. Such tactical naval nuclear weapons were considered more acceptable to use early in a conflict because there would be few civilian casualties. It was feared by many planners that such use would probably quickly have escalated into a large-scale nuclear war. This situation

15209-408: The headquarters of the 2nd General Army and Fifth Division ) and killing approximately 70,000 people, including 20,000 Japanese combatants and 20,000 Korean slave laborers. Three days later, on August 9, a plutonium-type nuclear weapon codenamed " Fat Man " was used against the Japanese city of Nagasaki, with the explosion equivalent to about 20 kilotons of TNT (84,000 gigajoules), destroying 60% of

15436-459: The human extinction , or at least its near extinction, with only a relatively small number of survivors (mainly in remote areas) and a reduced quality of life and life expectancy for centuries afterward. However, such predictions, assuming total war with nuclear arsenals at Cold War highs, have not been without criticism. Such a horrific catastrophe as global nuclear warfare would almost certainly cause permanent damage to most complex life on

15663-417: The hypocenter immediately after the blast. The exercise was conducted on September 14, 1954, under command of Marshal Georgy Zhukov to the north of Totskoye village in Orenburg Oblast , Russia . A revolution in nuclear strategic thought occurred with the introduction of the intercontinental ballistic missile (ICBM), which the Soviet Union first successfully tested in August 1957. In order to deliver

15890-430: The instrument of surrender on 2 September, effectively ending the war . In the final year of World War II , the Allies prepared for a costly invasion of the Japanese mainland . This undertaking was preceded by a conventional bombing and firebombing campaign that devastated 64 Japanese cities, including an operation on Tokyo . The war in the European theatre concluded when Germany surrendered on 8 May 1945, and

16117-461: The nuclear arms race starting in 1949 and conventional military deployment , the struggle for dominance was expressed indirectly via psychological warfare , propaganda campaigns , espionage , far-reaching embargoes , sports diplomacy , and technological competitions such as the Space Race . The US and USSR were both part of the Allies of World War II , the military coalition which had defeated Nazi Germany and Imperial Japan in 1945. After

16344-505: The poisoning of Alexander Litvinenko was described by medical professionals, as "an ominous landmark: the beginning of an era of nuclear terrorism ." Alternatives to nuclear warfare include nuclear deterrence , nuclear disarmament and Treaty on the Non-Proliferation of Nuclear Weapons . During the final stages of World War II in 1945, the United States conducted atomic raids on the Japanese cities of Hiroshima and Nagasaki ,

16571-406: The "acceptability" of using nuclear weapons. Combined with the trend in the reduction in the worldwide nuclear arsenal as of 2007 is the warhead miniaturization and modernization of the remaining strategic weapons that is presently occurring in all the declared nuclear weapon states, into more "usable" configurations. The Stockholm International Peace Research Institute suggests that this is creating

16798-423: The 1980s, but subsequently became the first country to voluntarily destroy their domestically made weapons stocks and abandon further production (1990s). Nuclear weapons have been detonated on over 2,000 occasions for testing purposes and demonstrations. After the dissolution of the Soviet Union in 1991 and the resultant end of the Cold War, the threat of a major nuclear war between the two nuclear superpowers

17025-399: The 393d Bombardment Squadron plus one from the 216th Army Air Force Base Unit, and transported to North Field, arriving on 2 August. At the time of its bombing, Hiroshima was a city of industrial and military significance. A number of military units were located nearby, the most important of which was the headquarters of Field Marshal Shunroku Hata 's Second General Army , which commanded

17252-422: The 3rd Anti-Aircraft Division, including units from the 121st and 122nd Anti-Aircraft Regiments and the 22nd and 45th Separate Anti-Aircraft Battalions. In total, an estimated 40,000 Japanese military personnel were stationed in the city. Hiroshima was a supply and logistics base for the Japanese military. The city was a communications center, a key port for shipping, and an assembly area for troops. It supported

17479-475: The 509th Composite Group about the possibility of a B-29 crashing on takeoff, Birch had modified the Little Boy design to incorporate a removable breech plug that would permit the bomb to be armed in flight. The first plutonium core , along with its polonium - beryllium urchin initiator , was transported in the custody of Project Alberta courier Raemer Schreiber in a magnesium field carrying case designed for

17706-523: The 509th Composite Group moved by rail on 26 April 1945, to its port of embarkation at Seattle , Washington. On 6 May the support elements sailed on the SS Cape Victory for the Marianas, while group materiel was shipped on the SS Emile Berliner . The Cape Victory made brief port calls at Honolulu and Eniwetok but the passengers were not permitted to leave the dock area. An advance party of

17933-523: The 509th had attached to it on Tinian 51 civilian and military personnel from Project Alberta , known as the 1st Technical Detachment. The 509th Composite Group's 393d Bombardment Squadron was equipped with 15 Silverplate B-29s. These aircraft were specially adapted to carry nuclear weapons, and were equipped with fuel-injected engines, Curtiss Electric reversible-pitch propellers , pneumatic actuators for rapid opening and closing of bomb bay doors and other improvements. The ground support echelon of

18160-452: The Allies advanced towards Japan, conditions became steadily worse for the Japanese people. Japan's merchant fleet declined from 5,250,000 gross register tons in 1941 to 1,560,000 tons in March 1945, and 557,000 tons in August 1945. The lack of raw materials forced the Japanese war economy into a steep decline after the middle of 1944. The civilian economy, which had slowly deteriorated throughout

18387-484: The Allies turned their full attention to the Pacific War . By July 1945, the Allies' Manhattan Project had produced two types of atomic bombs: " Little Boy ", an enriched uranium gun-type fission weapon , and " Fat Man ", a plutonium implosion-type nuclear weapon . The 509th Composite Group of the United States Army Air Forces was trained and equipped with the specialized Silverplate version of

18614-706: The Americans, with their limited nuclear arsenal, were unlikely to engage in any new world wars, while the Americans were not confident they could prevent a Soviet takeover of Europe, despite their atomic advantage. Within the United States, the authority to produce and develop nuclear weapons was removed from military control and put instead under the civilian control of the United States Atomic Energy Commission . This decision reflected an understanding that nuclear weapons had unique risks and benefits that were separate from other military technology known at

18841-446: The British newspaper Tribune . Contemplating a world living in the shadow of the threat of nuclear warfare , Orwell looked at James Burnham 's predictions of a polarized world, writing: Looking at the world as a whole, the drift for many decades has been not towards anarchy but towards the reimposition of slavery... James Burnham's theory has been much discussed, but few people have yet considered its ideological implications—that is,

19068-509: The Clock has been set at 90 seconds to midnight, the closest it has ever been. The most recent advance of the Clock's time setting was largely attributed to the risk of nuclear escalation that arose from the Russian invasion of Ukraine. Nuclear warfare scenarios are usually divided into two groups, each with different effects and potentially fought with different types of nuclear armaments. The first,

19295-558: The Cold War , though none resulted in the use of nuclear weapons. Many such scenarios have been depicted in popular culture , such as in the 1959 film On the Beach , the 1962 novel Fail-Safe , the 1964 film Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb , the 1983 film WarGames , and the 1984 film Threads . The above examples envisage nuclear warfare at a strategic level, i.e., total war . However, nuclear powers have

19522-460: The Cold War was in its essence a war of ideas. The United States, acting through the CIA, funded a long list of projects to counter the communist appeal among intellectuals in Europe and the developing world. The CIA also covertly sponsored a domestic propaganda campaign called Crusade for Freedom . The rearmament of West Germany was achieved in the early 1950s. Its main promoter was Konrad Adenauer ,

19749-459: The Cold War, preventing Western food, materials and supplies from arriving in the West Germany's exclave of West Berlin . The United States (primarily), Britain, France, Canada, Australia, New Zealand, and several other countries began the massive "Berlin airlift", supplying West Berlin with food and other provisions despite Soviet threats. The Soviets mounted a public relations campaign against

19976-743: The Communist governments militarily. The fall of the Iron Curtain after the Pan-European Picnic and the Revolutions of 1989 , which represented a peaceful revolutionary wave with the exception of the Romanian revolution and the Afghan Civil War (1989–1992) , overthrew almost all of the Marxist–Leninist regimes of the Eastern Bloc. The Communist Party of the Soviet Union itself lost control in

20203-458: The Japanese home islands. The U.S. manufacture of 500,000 Purple Hearts from the anticipated high level of casualties during the U.S. invasion of Japan gave a demonstration of how deadly and costly it would be. President Harry S. Truman realized he could not afford such a horrendous casualty rate, especially since over 400,000 American combatants had already died fighting in both the European and

20430-400: The KGB (1973–1979), described active measures as "the heart and soul of Soviet intelligence ." During the Sino-Soviet split , "spy wars" also occurred between the USSR and PRC. In September 1947, the Soviets created Cominform to impose orthodoxy within the international communist movement and tighten political control over Soviet satellites through coordination of communist parties in

20657-462: The Manhattan Project took place at dozens of sites across the United States, and even some outside of its borders. It would ultimately cost over US$ 2 billion (equivalent to about $ 27 billion in 2023) and employ over 125,000 people simultaneously at its peak. Groves appointed J. Robert Oppenheimer to organize and head the project's Los Alamos Laboratory in New Mexico , where bomb design work

20884-706: The Marianas proved just as ineffective as the China-based B-29s had been. Hansell continued the practice of conducting so-called high-altitude precision bombing , aimed at key industries and transportation networks, even after these tactics had not produced acceptable results. These efforts proved unsuccessful due to logistical difficulties with the remote location, technical problems with the new and advanced aircraft, unfavorable weather conditions, and enemy action. Hansell's successor, Major General Curtis LeMay , assumed command in January 1945 and initially continued to use

21111-484: The Marshall Plan, seeing it as an effort by the US to impose its influence on Europe. In response, the Soviet Union established Comecon (Council for Mutual Economic Assistance) to foster economic cooperation among communist states. The United States and its Western European allies sought to strengthen their bonds and used the policy of containment against Soviet influence; they accomplished this most notably through

21338-561: The Pacific, the Allies returned to the Philippines , recaptured Burma , and invaded Borneo . Offensives were undertaken to reduce the Japanese forces remaining in Bougainville , New Guinea and the Philippines. In April 1945, American forces landed on Okinawa , where heavy fighting continued until June. Along the way, the ratio of Japanese to American casualties dropped from five to one in

21565-413: The Philippines to two to one on Okinawa. Although some Japanese soldiers were taken prisoner , most fought until they were killed or committed suicide . Nearly 99 percent of the 21,000 defenders of Iwo Jima were killed. Of the 117,000 Okinawan and Japanese troops defending Okinawa in April to June 1945, 94 percent were killed; 7,401 Japanese soldiers surrendered, an unprecedentedly large number. As

21792-555: The Quebec Agreement, discussion then turned to what scientific details would be revealed in the press announcement of the bombing. The meeting also considered what Truman could reveal to Joseph Stalin , the leader of the Soviet Union , at the upcoming Potsdam Conference , as this also required British concurrence. Orders for the attack were issued to General Carl Spaatz on 25 July under the signature of General Thomas T. Handy ,

22019-506: The Russian Civil War further complicated relations, and although the Soviet Union later allied with Western powers to defeat Nazi Germany , this cooperation was strained by mutual suspicions. In the immediate aftermath of World War II, disagreements about the future of Europe, particularly Eastern Europe , became central. The Soviet Union's establishment of communist regimes in the countries it had liberated from Nazi control—enforced by

22246-461: The Soviet Union was used to monitor dissent from official Soviet politics and morals. Although to an extent disinformation had always existed, the term itself was invented, and the strategy formalized by a black propaganda department of the Soviet KGB. Based on the amount of top-secret Cold War archival information that has been released, historian Raymond L. Garthoff concludes there probably

22473-556: The Soviet Union, which at the time was undergoing the Era of Stagnation . This phase saw the new Soviet leader Mikhail Gorbachev introducing the liberalizing reforms of glasnost ("openness") and perestroika ("reorganization") and ending Soviet involvement in Afghanistan in 1989. Pressures for national sovereignty grew stronger in Eastern Europe, and Gorbachev refused to further support

22700-448: The Soviet Union, with an estimated 16 million deaths in the Soviet Union (half of whom were estimated to be killed on impact and the rest fatally injured) before bomber aircraft from the U.S. Strategic Air Command reached their targets. Although the Soviet Union had nuclear weapon capabilities at the beginning of the Cold War , the United States still had an advantage in terms of bombers and weapons. In any exchange of hostilities,

22927-558: The Soviet Union. A number of self-proclaimed Marxist–Leninist governments were formed in the second half of the 1970s in developing countries , including Angola , Mozambique , Ethiopia , Cambodia , Afghanistan , and Nicaragua . Détente collapsed at the end of the decade with the beginning of the Soviet–Afghan War in 1979. Beginning in the 1980s, this phase was another period of elevated tension. The Reagan Doctrine led to increased diplomatic, military, and economic pressures on

23154-574: The Soviets accumulated after broken promises by Stalin and Molotov concerning Europe and Iran. Following the World War II Anglo-Soviet invasion of Iran , the country was occupied by the Red Army in the far north and the British in the south. Iran was used by the United States and British to supply the Soviet Union, and the Allies agreed to withdraw from Iran within six months after the cessation of hostilities. However, when this deadline came,

23381-525: The Soviets agreed to withdraw from Iran after persistent US pressure, an early success of containment policy. By 1947, US president Harry S. Truman was outraged by the perceived resistance of the Soviet Union to American demands in Iran, Turkey, and Greece, as well as Soviet rejection of the Baruch Plan on nuclear weapons. In February 1947, the British government announced that it could no longer afford to finance

23608-538: The Soviets had permitted to retain democratic structures. The public brutality of the coup shocked Western powers more than any event up to that point, set in motion a brief scare that war would occur, and swept away the last vestiges of opposition to the Marshall Plan in the United States Congress. In an immediate aftermath of the crisis, the London Six-Power Conference was held, resulting in

23835-533: The Soviets remained in Iran under the guise of the Azerbaijan People's Government and Kurdish Republic of Mahabad . Shortly thereafter, on 5 March, former British prime minister Winston Churchill delivered his famous " Iron Curtain " speech in Fulton, Missouri . The speech called for an Anglo-American alliance against the Soviets, whom he accused of establishing an "iron curtain" dividing Europe from " Stettin in

24062-513: The Truman Doctrine marked the beginning of a US bipartisan defense and foreign policy consensus between Republicans and Democrats focused on containment and deterrence that weakened during and after the Vietnam War , but ultimately persisted thereafter. Moderate and conservative parties in Europe, as well as social democrats, gave virtually unconditional support to the Western alliance, while European and American Communists , financed by

24289-455: The U.S. The USSR solidified its domination of Eastern Europe with the crushing of the Hungarian Revolution in 1956 and the Warsaw Pact invasion of Czechoslovakia in 1968. Both powers used economic aid in an attempt to win the loyalty of non-aligned countries , such as India . After the Sino-Soviet split between the USSR and China in 1961, the U.S. initiated contacts with China in 1972 . In

24516-454: The U.S. government to avoid bombing Hiroshima. More realistic city officials had ordered buildings torn down to create long, straight firebreaks . These continued to be expanded and extended up to the morning of 6 August 1945. Cold War The Cold War was a period of global geopolitical tension and struggle for ideological and economic influence between the United States and

24743-484: The U.S. wrapped up the two-and-a-half-month Battle of Okinawa (which cost the lives of 260,000 people, including 150,000 civilians), it was faced with the prospect of invading the Japanese home islands in an operation codenamed Operation Downfall . Based on the U.S. casualties from the preceding island-hopping campaigns , American commanders estimated that between 50,000 and 500,000 U.S. troops would die and at least 600,000–1,000,000 others would be injured while invading

24970-552: The US assistance, the Greek military won its civil war . Under the leadership of Alcide De Gasperi the Italian Christian Democrats defeated the powerful Communist – Socialist alliance in the elections of 1948 . All major powers engaged in espionage, using a great variety of spies, double agents , moles , and new technologies such as the tapping of telephone cables. The Soviet KGB ("Committee for State Security"),

25197-522: The US government gave to Western European countries over $ 13 billion (equivalent to $ 189 billion in 2016) to rebuild the economy of Europe . Later, the program led to the creation of the OECD . The plan's aim was to rebuild the democratic and economic systems of Europe and to counter perceived threats to the European balance of power , such as communist parties seizing control through revolutions or elections. The plan also stated that European prosperity

25424-414: The US nuclear war fighting plan/ SIOP every decade since. For example, the United States adopted a policy in 1996 of allowing the targeting of its nuclear weapons at non-state actors (" terrorists ") armed with weapons of mass destruction . Another dimension to the tactical use of nuclear weapons is that of such weapons deployed at sea for use against surface and submarine vessels. Until 1992, vessels of

25651-522: The US was trying to buy a pro-US re-alignment of Europe. Stalin therefore prevented Eastern Bloc nations from receiving Marshall Plan aid. The Soviet Union's alternative to the Marshall Plan, which was purported to involve Soviet subsidies and trade with central and eastern Europe, became known as the Molotov Plan (later institutionalized in January 1949 as the Council for Mutual Economic Assistance ). Stalin

25878-632: The USAAF; and scientists John von Neumann , Robert R. Wilson and William Penney from the Manhattan Project. The Target Committee met in Washington on 27 April; at Los Alamos on 10 May, where it was able to talk to the scientists and technicians there; and finally in Washington on 28 May, where it was briefed by Tibbets and Commander Frederick Ashworth from Project Alberta, and the Manhattan Project's scientific advisor, Richard C. Tolman . The Target Committee nominated five targets: Kokura (now Kitakyushu ),

26105-477: The USSR. In this way, this US would exercise " preponderant power ," oppose neutrality, and establish global hegemony . In the early 1950s (a period sometimes known as the " Pactomania "), the US formalized a series of alliances with Japan (a former WWII enemy), South Korea , Taiwan , Australia , New Zealand , Thailand and the Philippines (notably ANZUS in 1951 and SEATO in 1954), thereby guaranteeing

26332-516: The United Nations, was split up and dissolved in 1954 and 1975, also because of the détente between the West and Tito. The US and Britain merged their western German occupation zones into " Bizone " (1 January 1947, later "Trizone" with the addition of France's zone, April 1949). As part of the economic rebuilding of Germany, in early 1948, representatives of a number of Western European governments and

26559-509: The United States a number of long-term military bases. One of the more significant examples of the implementation of containment was the United Nations US-led intervention in the Korean War . In June 1950, after years of mutual hostilities, Kim Il Sung 's North Korean People's Army invaded South Korea at the 38th parallel . Stalin had been reluctant to support the invasion but ultimately sent advisers. To Stalin's surprise,

26786-465: The United States and the Soviet Union. On August 29, 1949, the Soviet Union tested its first nuclear weapon at Semipalatinsk in Kazakhstan (see also Soviet atomic bomb project ). Scientists in the United States from the Manhattan Project had warned that, in time, the Soviet Union would certainly develop nuclear capabilities of its own. Nevertheless, the effect upon military thinking and planning in

27013-401: The United States announced an agreement for a merger of western German areas into a federal governmental system. In addition, in accordance with the Marshall Plan , they began to re-industrialize and rebuild the West German economy, including the introduction of a new Deutsche Mark currency to replace the old Reichsmark currency that the Soviets had debased. The US had secretly decided that

27240-489: The United States detonated two atomic bombs over the Japanese cities of Hiroshima and Nagasaki , respectively. The bombings killed between 150,000 and 246,000 people, most of whom were civilians, and remain the only use of nuclear weapons in an armed conflict. Japan surrendered to the Allies on 15 August, six days after the bombing of Nagasaki and the Soviet Union's declaration of war against Japan and invasion of Japanese-occupied Manchuria . The Japanese government signed

27467-541: The United States in World War II included both military personnel killed in action and wounded in action . Nearly one million of the casualties occurred during the last year of the war, from June 1944 to June 1945. In December 1944, American battle casualties hit an all-time monthly high of 88,000 as a result of the German Ardennes Offensive . Worried by the losses sustained, President Roosevelt suggested

27694-415: The United States was dramatic, primarily because American military strategists had not anticipated the Soviets would "catch up" so soon. However, at this time, they had not discovered that the Soviets had conducted significant nuclear espionage of the project from spies at Los Alamos National Laboratory , the most significant of which was done by the theoretical physicist Klaus Fuchs . The first Soviet bomb

27921-469: The United States would have been capable of bombing the Soviet Union, whereas the Soviet Union would have more difficulty carrying out the reverse mission. The widespread introduction of jet -powered interceptor aircraft upset this imbalance somewhat by reducing the effectiveness of the American bomber fleet. In 1949 Curtis LeMay was placed in command of the Strategic Air Command and instituted

28148-504: The Warsaw Pact's primary function was to safeguard Soviet hegemony over its Eastern European satellites, with the pact's only direct military actions having been the invasions of its own member states to keep them from breaking away; in the 1960s, the pact evolved into a multilateral alliance, in which the non-Soviet Warsaw Pact members gained significant scope to pursue their own interests. In 1961, Soviet-allied East Germany constructed

28375-423: The Western agencies paid special attention to debriefing Eastern Bloc defectors . Edward Jay Epstein describes that the CIA understood that the KGB used "provocations", or fake defections, as a trick to embarrass Western intelligence and establish Soviet double agents. As a result, from 1959 to 1973, the CIA required that East Bloc defectors went through a counterintelligence investigation before being recruited as

28602-493: The ability to undertake more limited engagements. "Sub-strategic use" includes the use of either "low-yield" tactical nuclear weapons, or of variable yield strategic nuclear weapons in a very limited role, as compared to exchanges of larger-yield strategic nuclear weapons over major population centers . This was described by the UK Parliamentary Defence Select Committee as "the launch of one or

28829-456: The accusation that the USSR was exerting increasing control over the countries lying in its sphere. He argued that there was nothing surprising in "the fact that the Soviet Union, anxious for its future safety, [was] trying to see to it that governments loyal in their attitude to the Soviet Union should exist in these countries." Soviet territorial demands to Turkey regarding the Dardanelles in

29056-593: The acting chief of staff, since Marshall was at the Potsdam Conference with Truman. It read in part: That day, Truman noted in his diary that: This weapon is to be used against Japan between now and August 10th. I have told the Sec. of War, Mr. Stimson, to use it so that military objectives and soldiers and sailors are the target and not women and children. Even if the Japs are savages, ruthless, merciless and fanatic, we as

29283-467: The air echelon, consisting of 29 officers and 61 enlisted men, flew by C-54 to North Field on Tinian, between 15 and 22 May. There were also two representatives from Washington, D.C., Brigadier General Thomas Farrell , the deputy commander of the Manhattan Project, and Rear Admiral William R. Purnell of the Military Policy Committee, who were on hand to decide higher policy matters on

29510-452: The air raids to preserve fighter aircraft to counter the expected invasion. By mid-1945 the Japanese only occasionally scrambled aircraft to intercept individual B-29s conducting reconnaissance sorties over the country, to conserve supplies of fuel. In July 1945, the Japanese had 137,800,000 litres (1,156,000 US bbl) of avgas stockpiled for the invasion of Japan. About 72,000,000 litres (604,000 US bbl) had been consumed in

29737-547: The allocation of $ 400 million to intervene in the war and unveiled the Truman Doctrine , which framed the conflict as a contest between free peoples and totalitarian regimes. American policymakers accused the Soviet Union of conspiring against the Greek royalists in an effort to expand Soviet influence even though Stalin had told the Communist Party to cooperate with the British-backed government. Enunciation of

29964-526: The arsenals of the United States and the Soviet Union, Western Europe 's nuclear reserves were nevertheless a significant factor in strategic planning during the Cold War . A top-secret White paper , compiled by the Royal Air Force and produced for the British Government in 1959, estimated that British V bombers carrying nuclear weapons were capable of destroying key cities and military targets in

30191-485: The atomic attack, and the Japanese could deny the atomic bomb was lethal, making the mission less likely to produce surrender. Allied prisoners of war might be moved to the demonstration site and be killed by the bomb. They also worried that the bomb might be a failure, as the Trinity test was that of a stationary device, not an air-dropped bomb. In addition, although more bombs were in production, only two would be available at

30418-470: The bombing campaign to be further escalated. Aircraft flying from Allied aircraft carriers and the Ryukyu Islands also regularly struck targets in Japan during 1945 in preparation for Operation Downfall. Firebombing switched to smaller cities, with populations ranging from 60,000 to 350,000. According to Yuki Tanaka , the U.S. fire-bombed over a hundred Japanese towns and cities. The Japanese military

30645-450: The bombing. Within a few hours of the raid, it had killed an estimated 100,000 people and destroyed 41 km (16 sq mi) of the city and 267,000 buildings in a single night — the deadliest bombing raid in military aviation history other than the atomic raids on Hiroshima and Nagasaki. By early August 1945, an estimated 450,000 people had died as the U.S. had intensely firebombed a total of 67 Japanese cities. In late June 1945, as

30872-426: The bureau responsible for foreign espionage and internal surveillance, was famous for its effectiveness. The most famous Soviet operation involved its atomic spies that delivered crucial information from the United States' Manhattan Project , leading the USSR to detonate its first nuclear weapon in 1949, four years after the American detonation and much sooner than expected. A massive network of informants throughout

31099-442: The chance that one of them might be a dud. If the test were made on some neutral territory, it was hard to believe that Japan's determined and fanatical military men would be impressed. If such an open test were made first and failed to bring surrender, the chance would be gone to give the shock of surprise that proved so effective. On the contrary, it would make the Japanese ready to interfere with an atomic attack if they could. Though

31326-642: The chancellor of West Germany, with France the main opponent. Washington had the decisive voice. It was strongly supported by the Pentagon (the US military leadership), and weakly opposed by President Truman; the State Department was ambivalent. The outbreak of the Korean War in June 1950 changed the calculations and Washington now gave full support. That also involved naming Dwight D. Eisenhower in charge of NATO forces and sending more American troops to West Germany. There

31553-426: The city and 267,000 buildings in a single night. It was the deadliest bombing raid of the war, at a cost of 20 B-29s shot down by flak and fighters. By May, 75 percent of bombs dropped were incendiaries designed to burn down Japan's "paper cities". By mid-June, Japan's six largest cities had been devastated. The end of the fighting on Okinawa that month provided airfields even closer to the Japanese mainland, allowing

31780-500: The city and killing approximately 35,000 people, including 23,200–28,200 Japanese munitions workers, 2,000 Korean slave laborers, and 150 Japanese combatants. The industrial damage in Nagasaki was high, partly owing to the inadvertent targeting of the industrial zone, leaving 68–80 percent of the non-dock industrial production destroyed. The U.S., despite not having a third device ready to be dropped, gave Japan one last warning that there would be another bombing if they did not surrender, and

32007-508: The communist party. Radio and television organizations were state-owned, while print media was usually owned by political organizations, mostly by the local communist party. Soviet radio broadcasts used Marxist rhetoric to attack capitalism, emphasizing themes of labor exploitation, imperialism and war-mongering. Along with the broadcasts of the BBC and the Voice of America to Central and Eastern Europe,

32234-461: The communist regimes of the Eastern Bloc in 1989 and the collapse of the Soviet Union in 1991. The Western Bloc included the US and a number of First World nations that were generally capitalist and liberal democratic but tied to a network of often authoritarian Third World states, most of which were the European powers' former colonies . The Eastern Bloc was led by the Soviet Union and its communist party , which had an influence across

32461-492: The country and was banned following the 1991 Soviet coup attempt that August. This in turn led to the formal dissolution of the Soviet Union in December 1991 and the collapse of Communist governments across much of Africa and Asia. The Russian Federation became the Soviet Union's successor state, while many of the other republics emerged from the Soviet Union's collapse as fully independent post-Soviet states . The United States

32688-411: The dead were civilians. Scholars have extensively studied the effects of the bombings on the social and political character of subsequent world history and popular culture , and there is still much debate concerning the ethical and legal justification for the bombings. According to supporters, the atomic bombings were necessary to bring an end to the war with minimal casualties and ultimately prevented

32915-470: The deaths of approximately 200,000 people and contributed to the surrender of Japan , which occurred before any further nuclear weapons could be deployed. After World War II , nuclear weapons were also developed by the Soviet Union (1949), the United Kingdom (1952), France (1960), and the People's Republic of China (1964), which contributed to the state of conflict and extreme tension that became known as

33142-519: The defense of all of southern Japan, and was located in Hiroshima Castle . Hata's command consisted of some 400,000 men, most of whom were on Kyushu where an Allied invasion was correctly anticipated. Also present in Hiroshima were the headquarters of the 59th Army , the 5th Division and the 224th Division , a recently formed mobile unit. The city was defended by five batteries of 70 mm and 80 mm (2.8 and 3.1 inch) anti-aircraft guns of

33369-599: The difference between "strategic", "sub-strategic", and "tactical" use or weapons. American, French and British nuclear submarines are believed to carry at least some missiles with dial-a-yield warheads for this purpose, potentially allowing a strike as low as one kiloton (or less) against a single target. Only the People's Republic of China and the Republic of India have declarative, unqualified, unconditional " no first use " nuclear weapons policies. India and Pakistan maintain only

33596-464: The entire war. In February 1945, Prince Fumimaro Konoe advised Emperor Hirohito that defeat was inevitable, and urged him to abdicate. Even before the surrender of Nazi Germany on 8 May 1945, plans were underway for the largest operation of the Pacific War, Operation Downfall , the Allied invasion of Japan. The operation had two parts: set to begin in October 1945, Operation Olympic involved

33823-429: The final adjustments of the bomb the Japanese defenders should attack, a faulty move might easily result in some kind of failure. Such an end to an advertised demonstration of power would be much worse than if the attempt had not been made. It was now evident that when the time came for the bombs to be used we should have only one of them available, followed afterwards by others at all-too-long intervals. We could not afford

34050-401: The first on August 6, 1945, and the second on August 9, 1945. These two events were the only times nuclear weapons have been used in combat . For six months before the atomic bombings, the U.S. 20th Air Force under General Curtis LeMay executed low-level incendiary raids against Japanese cities . The most destructive air raid to occur during the process was not the nuclear attacks, but

34277-401: The formation of NATO , which was essentially a defensive agreement in 1949. The Soviet Union countered with the Warsaw Pact in 1955, which had similar results with the Eastern Bloc. As by that time the Soviet Union already had an armed presence and political domination all over its eastern satellite states, the pact has been long considered superfluous. Although nominally a defensive alliance,

34504-486: The funding of left-wing parties , wars of independence , revolutions and dictatorships. As nearly all the colonial states underwent decolonization and achieved independence in the period from 1945 to 1960, many became Third World battlefields in the Cold War. At the end of World War II, English writer George Orwell used cold war , as a general term, in his essay "You and the Atomic Bomb", published 19 October 1945 in

34731-561: The government position. Japan's willingness to surrender remained conditional on the preservation of the kokutai (Imperial institution and national polity ), assumption by the Imperial Headquarters of responsibility for disarmament and demobilization, no occupation of the Japanese Home Islands , Korea or Formosa , and delegation of the punishment of war criminals to the Japanese government. At Potsdam, Truman agreed to

34958-454: The greatest psychological effect against Japan and (2) making the initial use sufficiently spectacular for the importance of the weapon to be internationally recognized when publicity on it is released.   ... Kyoto has the advantage of the people being more highly intelligent and hence better able to appreciate the significance of the weapon. Hiroshima has the advantage of being such a size and with possible focussing from nearby mountains that

35185-565: The home islands area in April, May and June 1945. While the Japanese military decided to resume attacks on Allied bombers from late June, by this time there were too few operational fighters available for this change of tactics to hinder the Allied air raids. The discovery of nuclear fission in 1938 made the development of an atomic bomb a theoretical possibility. Fears that a German atomic bomb project would develop atomic weapons first, especially among scientists who were refugees from Nazi Germany and other fascist countries, were expressed in

35412-484: The home islands, backed by a civilian militia of 28 million. Casualty predictions varied widely, but were extremely high. The Vice Chief of the Imperial Japanese Navy General Staff , Vice Admiral Takijirō Ōnishi , predicted up to 20 million Japanese deaths. The Americans were alarmed by the Japanese buildup, which was accurately tracked through Ultra intelligence. On 15 June 1945,

35639-596: The industrial buildings were also built around timber frames. The city as a whole was highly susceptible to fire damage. It was the second largest city in Japan after Kyoto that was still undamaged by air raids, primarily because it lacked the aircraft manufacturing industry that was the XXI Bomber Command's priority target. On 3 July, the Joint Chiefs of Staff placed it off limits to bombers, along with Kokura, Niigata and Kyoto. The population of Hiroshima had reached

35866-621: The invasion . Since 1947, the Doomsday Clock of the Bulletin of the Atomic Scientists has visualized how close the world is to a nuclear war. The Doomsday Clock reached high points in 1953, when the Clock was set to two minutes until midnight after the U.S. and the Soviet Union began testing hydrogen bombs, and in 2018, following the failure of world leaders to address tensions relating to nuclear weapons and climate change issues. Since 2023,

36093-463: The invincibility of the United States to a nuclear attack. Indeed, it became generally believed that the threat of nuclear war would deter any strike against the United States. Many proposals were suggested to put all American nuclear weapons under international control (by the newly formed United Nations , for example) as an effort to deter both their usage and a nuclear arms race . However, no terms could be arrived at that would be agreed upon by both

36320-518: The kind of world-view, the kind of beliefs, and the social structure that would probably prevail in a state which was at once unconquerable and in a permanent state of "cold war" with its neighbours. In The Observer of 10 March 1946, Orwell wrote, "...after the Moscow conference last December, Russia began to make a 'cold war' on Britain and the British Empire." The first use of the term to describe

36547-466: The leader of the world for the common welfare cannot drop that terrible bomb on the old capital [Kyoto] or the new [Tokyo]. He and I are in accord. The target will be a purely military one. The 16 July success of the Trinity Test in the New Mexico desert exceeded expectations. On 26 July, Allied leaders issued the Potsdam Declaration , which outlined the terms of surrender for Japan. The declaration

36774-507: The line from the Hindu scripture the Bhagavad Gita . Vishnu is trying to persuade the prince that he should do his duty and to impress him takes on his multiarmed form and says, "Now, I am become Death, the destroyer of worlds." I suppose we all thought that one way or another. Immediately after the atomic bombings of Japan, the status of atomic weapons in international and military relations

37001-412: The matter. Truman agreed with Stimson, and Kyoto was temporarily removed from the target list. Groves attempted to restore Kyoto to the target list in July, but Stimson remained adamant. On 25 July, Nagasaki was put on the target list in place of Kyoto. It was a major military port, one of Japan's largest shipbuilding and repair centers, and an important producer of naval ordnance. In early May 1945,

37228-470: The meetings on 31 May and 1 June, scientist Ernest Lawrence had suggested giving the Japanese a non-combat demonstration. Arthur Compton later recalled that: It was evident that everyone would suspect trickery. If a bomb were exploded in Japan with previous notice, the Japanese air power was still adequate to give serious interference. An atomic bomb was an intricate device, still in the developmental stage. Its operation would be far from routine. If during

37455-421: The missions over Japan were flown by single unescorted bombers with a single payload to accustom the Japanese to this pattern. They also simulated actual atomic bombing runs, including the directions of ingress and egress with respect to the wind. Tibbets himself was barred from flying most missions over Japan for fear that he might be captured and interrogated. On 5 April 1945, the code name Operation Centerboard

37682-414: The most prominent architects of America's early Cold War strategy, especially those who believed that the Cold War would eventually be fought by political rather than military means, such as George F. Kennan. Soviet and Eastern Bloc authorities used various methods to suppress Western broadcasts, including radio jamming . American policymakers, including Kennan and John Foster Dulles , acknowledged that

37909-615: The only way to destroy their production capabilities, shifting from precision bombing to area bombardment with incendiaries. Like most strategic bombing during World War II , the aim of the air offensive against Japan was to destroy the enemy's war industries, kill or disable civilian employees of these industries, and undermine civilian morale . Over the next six months, the XXI Bomber Command under LeMay firebombed 64 Japanese cities. The firebombing of Tokyo , codenamed Operation Meetinghouse , on 9–10 March, killed an estimated 100,000 people and destroyed 41 km (16 sq mi) of

38136-498: The planet, its ecosystems, and the global climate. A study presented at the annual meeting of the American Geophysical Union in December 2006 asserted that a small-scale regional nuclear war could produce as many direct fatalities as all of World War II and disrupt the global climate for a decade or more. In a regional nuclear conflict scenario in which two opposing nations in the subtropics each used 50 Hiroshima-sized nuclear weapons (c. 15 kiloton each) on major population centers,

38363-559: The policy change. Once again, the East Berlin communists attempted to disrupt the Berlin municipal elections , which were held on 5 December 1948 and produced a turnout of 86% and an overwhelming victory for the non-communist parties. The results effectively divided the city into East and West, the latter comprising US, British and French sectors. 300,000 Berliners demonstrated and urged the international airlift to continue, and US Air Force pilot Gail Halvorsen created " Operation Vittles ", which supplied candy to German children. The Airlift

38590-441: The political decision-making level on either side. Similarly, there is no evidence, on either side, of any major political or military decision that was prematurely discovered through espionage and thwarted by the other side. There also is no evidence of any major political or military decision that was crucially influenced (much less generated) by an agent of the other side. According to historian Robert L. Benson, "Washington's forte

38817-464: The possibility of a demonstration that would not destroy human lives was attractive, no one could suggest a way in which it could be made so convincing that it would be likely to stop the war. The possibility of a demonstration was raised again in the Franck Report issued by physicist James Franck on 11 June and the Scientific Advisory Panel rejected his report on 16 June, saying that "we can propose no technical demonstration likely to bring an end to

39044-424: The presence of the Red Army —alarmed the US and UK. Western leaders saw this as a clear instance of Soviet expansionism, clashing with their vision of a democratic Europe. Economically, the divide was sharpened with the introduction of the Marshall Plan in 1947, a US initiative to provide financial aid to rebuild Europe and prevent the spread of communism by stabilizing capitalist economies. The Soviet Union rejected

39271-400: The psychological impact of bombing, and reduce the international stigma of area-bombing cities. Even with the warnings, Japanese opposition to the war remained ineffective. In general, the Japanese regarded the leaflet messages as truthful, with many Japanese choosing to leave major cities. The leaflets caused such concern that the government ordered the arrest of anyone caught in possession of

39498-433: The purpose by Philip Morrison . Magnesium was chosen because it does not act as a neutron reflector . The core departed from Kirtland Army Air Field on a C-54 transport aircraft of the 509th Composite Group's 320th Troop Carrier Squadron on 26 July, and arrived at North Field 28 July. Three Fat Man high-explosive pre-assemblies, designated F31, F32, and F33, were picked up at Kirtland on 28 July by three B-29s, two from

39725-524: The rejection, President Truman authorized the dropping of the atomic bombs. At the time of its use, there were only two atomic bombs available, and despite the fact that more were in production back in mainland U.S. , the third bomb wouldn't be available for combat until September. On August 6, 1945, the uranium-type nuclear weapon codenamed " Little Boy " was detonated over the Japanese city of Hiroshima with an energy of about 15 kilotons of TNT (63,000 gigajoules), destroying nearly 50,000 buildings (including

39952-407: The researchers predicted fatalities ranging from 2.6 million to 16.7 million per country. The authors of the study estimated that as much as five million tons of soot could be released, producing a cooling of several degrees over large areas of North America and Eurasia (including most of the grain-growing regions). The cooling would last for years and could be "catastrophic", according to

40179-639: The researchers. Either a limited or full-scale nuclear exchange could occur during an accidental nuclear war , in which the use of nuclear weapons is triggered unintentionally. Postulated triggers for this scenario have included malfunctioning early warning devices and/or targeting computers, deliberate malfeasance by rogue military commanders, consequences of an accidental straying of warplanes into enemy airspace, reactions to unannounced missile tests during tense diplomatic periods, reactions to military exercises, mistranslated or miscommunicated messages, and others. A number of these scenarios actually occurred during

40406-424: The rest of the world were lost to them. This option was rejected with the formation of NATO and the decision to permanently station troops in Europe. In the summer of 1951, Project Vista started, in which project analysts such as Robert F. Christy looked at how to defend Western Europe from a Soviet invasion. The emerging development of tactical nuclear weapons was looked upon as a means to give Western forces

40633-416: The same precision bombing tactics, with equally unsatisfactory results. The attacks initially targeted key industrial facilities but much of the Japanese manufacturing process was carried out in small workshops and private homes. Under pressure from United States Army Air Forces (USAAF) headquarters in Washington, LeMay changed tactics and decided that low-level incendiary raids against Japanese cities were

40860-407: The same year, the US and USSR signed a series of arms control treaties limiting their nuclear arsenals, which eased tensions in a détente . In 1979, the toppling of pro-US governments in Iran and Nicaragua and a Soviet invasion of Afghanistan again raised fears of war. In 1985, Mikhail Gorbachev rose to leader of the USSR and expanded political freedoms in his country, which led to the fall of

41087-670: The security of nuclear weapons in newer nuclear powers with relatively less stable governments, such as Pakistan , but in each case, the fears have been addressed to some extent by statements and evidence provided by those nations, as well as cooperative programs between nations. Worry remains, however, in many circles that a relative decrease in the security of nuclear weapons has emerged in recent years, and that terrorists or others may attempt to exert control over (or use) nuclear weapons, militarily applicable technology, or nuclear materials and fuel. Another possible nuclear terrorism threat are devices designed to disperse radioactive materials over

41314-439: The site of one of Japan's largest munitions plants; Hiroshima , an embarkation port and industrial center that was the site of a major military headquarters; Yokohama , an urban center for aircraft manufacture, machine tools, docks, electrical equipment and oil refineries; Niigata , a port with industrial facilities including steel and aluminum plants and an oil refinery; and Kyoto , a major industrial center. The target selection

41541-405: The source of the term, Lippmann traced it to a French term from the 1930s, la guerre froide . The roots of the Cold War can be traced back to diplomatic and military tensions preceding World War II. The 1917 Russian Revolution and the subsequent Treaty of Brest-Litovsk , where Soviet Russia ceded vast territories to Germany, deepened distrust among the Western Allies. Allied intervention in

41768-463: The specific post-war geopolitical confrontation between the Soviet Union and the United States came in a speech by Bernard Baruch , an influential advisor to Democratic presidents, on 16 April 1947. The speech, written by journalist Herbert Bayard Swope , proclaimed, "Let us not be deceived: we are today in the midst of a cold war." Newspaper columnist Walter Lippmann gave the term wide currency with his book The Cold War . When asked in 1947 about

41995-429: The spot. Along with Captain William S. Parsons , the commander of Project Alberta, they became known as the "Tinian Joint Chiefs". In April 1945, Marshall asked Groves to nominate specific targets for bombing for final approval by himself and Stimson. Groves formed a Target Committee, chaired by himself, that included Farrell, Major John A. Derry, Colonel William P. Fisher, Joyce C. Stearns and David M. Dennison from

42222-400: The start of August, and they cost billions of dollars, so using one for a demonstration would be expensive. For several months, the U.S. had warned civilians of potential air raids by dropping more than 63 million leaflets across Japan. Many Japanese cities suffered terrible damage from aerial bombings; some were as much as 97 percent destroyed. LeMay thought that leaflets would increase

42449-494: The target nation, and would likely have a devastating effect on Earth's biosphere. Some Cold War strategists such as Henry Kissinger argued that a limited nuclear war could be possible between two heavily armed superpowers (such as the United States and the Soviet Union ). Some predict, however, that a limited war could potentially " escalate " into a full-scale nuclear war. Others have called limited nuclear war "global nuclear holocaust in slow motion", arguing that—once such

42676-454: The target would be Tokyo . Six days after the detonation over Nagasaki, Japan announced its surrender to the Allied Powers on August 15, 1945, signing the Instrument of Surrender on September 2, 1945, officially ending the Pacific War and, therefore, World War II, as Germany had already signed its Instrument of Surrender on May 8, 1945, ending the war in Europe . The two atomic bombings led, in part, to post-war Japan's adopting of

42903-414: The time. For several years after World War II , the United States developed and maintained a strategic force based on the Convair B-36 bomber that would be able to attack any potential enemy from bomber bases in the United States. It deployed atomic bombs around the world for potential use in conflicts. Over a period of a few years, many in the American defense community became increasingly convinced of

43130-425: The uncertainty of a successful detonation and also because of the wish to maximize shock in the leadership . No warning was given to Hiroshima that a new and much more destructive bomb was going to be dropped. Various sources gave conflicting information about when the last leaflets were dropped on Hiroshima prior to the atomic bomb. Robert Jay Lifton wrote that it was 27 July, and Theodore H. McNelly wrote that it

43357-406: The use of a weapon that was "readily available and which assuredly can decrease the cost in American lives": poison gas . Quantities of phosgene , mustard gas , tear gas and cyanogen chloride were moved to Luzon from stockpiles in Australia and New Guinea in preparation for Operation Olympic, and MacArthur ensured that Chemical Warfare Service units were trained in their use. Consideration

43584-408: The use of atomic bombs on Germany as soon as possible, but was informed the first usable atomic weapons were still months away. America's reserves of manpower were running out. Deferments for groups such as agricultural workers were tightened, and there was consideration of drafting women. At the same time, the public was becoming war-weary, and demanding that long-serving servicemen be sent home. In

43811-433: The war, reached disastrous levels by the middle of 1945. The loss of shipping also affected the fishing fleet, and the 1945 catch was only 22 percent of that in 1941. The 1945 rice harvest was the worst since 1909, and hunger and malnutrition became widespread. U.S. industrial production was overwhelmingly superior to Japan's. By 1943, the U.S. produced almost 100,000 aircraft a year, compared to Japan's production of 70,000 for

44038-409: The war, the USSR installed satellite governments in the territories of Eastern and Central Europe it had occupied, and promoted the spread of communism to North Korea in 1948 and created an alliance with the People's Republic of China in 1949. The US declared the Truman Doctrine of " containment " in 1947 as communist-led uprisings led to the Greek Civil War and First Indochina War , launched

44265-405: The war; we see no acceptable alternative to direct military use." Franck then took the report to Washington, D.C., where the Interim Committee met on 21 June to re-examine its earlier conclusions; but it reaffirmed that there was no alternative to the use of the bomb on a military target. Like Compton, many U.S. officials and scientists argued that a demonstration would sacrifice the shock value of

44492-469: The work was accelerated, first as a pilot program, and finally in the agreement by Roosevelt to turn the work over to the U.S. Army Corps of Engineers to construct the production facilities necessary to produce uranium-235 and plutonium-239 . This work was consolidated within the newly created Manhattan Engineer District, which became better known as the Manhattan Project , eventually under the direction of Major General Leslie R. Groves, Jr. . The work of

44719-400: The world. Movements against nuclear weapons testing and for nuclear disarmament took place, with large anti-war protests . By the 1970s, both sides had started making allowances for peace and security, ushering in a period of détente that saw the Strategic Arms Limitation Talks and the 1972 visit by Richard Nixon to China that opened relations with China as a strategic counterweight to

44946-432: The worst came to the worst and one-half dies, there will still be one-half left, but imperialism would be razed to the ground and the whole world would become socialist. After a few years there would be 2.7 billion people again. The concept of a "Fortress North America" emerged during the Second World War and persisted into the Cold War to refer to the option of defending Canada and the United States against their enemies if

45173-400: Was 'signals' intelligence - the procurement and analysis of coded foreign messages." leading to the Venona project or Venona intercepts, which monitored the communications of Soviet intelligence agents. Moynihan wrote that the Venona project contained "overwhelming proof of the activities of Soviet spy networks in America, complete with names, dates, places, and deeds." The Venona project

45400-427: Was 30 July. The USAAF history noted that eleven cities were targeted with leaflets on 27 July, but Hiroshima was not one of them, and there were no leaflet sorties on 30 July. Leaflet sorties were undertaken on 1 and 4 August. Hiroshima may have been leafleted in late July or early August, as survivor accounts talk about a delivery of leaflets a few days before the atomic bomb was dropped. Three versions were printed of

45627-408: Was a small response compared to the construction of a huge fleet of nuclear bombers. The principal nuclear strategy was to massively penetrate the Soviet Union. Because such a large area could not be defended against this overwhelming attack in any credible way, the Soviet Union would lose any exchange. This logic became ingrained in American nuclear doctrine and persisted for much of the duration of

45854-412: Was a strong promise that West Germany would not develop nuclear weapons. Widespread fears of another rise of German militarism necessitated the new military to operate within an alliance framework under NATO command. In 1955, Washington secured full German membership of NATO. In May 1953, Lavrentiy Beria , by then in a government post, had made an unsuccessful proposal to allow the reunification of

46081-418: Was also fearful of a reconstituted Germany; his vision of a post-war Germany did not include the ability to rearm or pose any kind of threat to the Soviet Union. In early 1948, following reports of strengthening "reactionary elements", Czech Communists executed a coup d'état in Czechoslovakia (resulting in the formation of the Czechoslovak Socialist Republic (9 May 1948)), the only Eastern Bloc state that

46308-481: Was also given to using biological weapons . While the United States had developed plans for an air campaign against Japan prior to the Pacific War, the capture of Allied bases in the western Pacific in the first weeks of the conflict meant that this offensive did not begin until mid-1944 when the long-ranged Boeing B-29 Superfortress became ready for use in combat. Operation Matterhorn involved India-based B-29s staging through bases around Chengdu in China to make

46535-433: Was as much a logistical as a political and psychological success for the West; it firmly linked West Berlin to the United States. In May 1949, Stalin backed down and lifted the blockade. In 1952, Stalin repeatedly proposed a plan to unify East and West Germany under a single government chosen in elections supervised by the United Nations, if the new Germany were to stay out of Western military alliances, but this proposal

46762-436: Was assigned. The officer responsible for its allocation in the War Department 's Operations Division was not cleared to know any details of it. The first bombing was later codenamed Operation Centerboard I, and the second, Operation Centerboard II. The 509th Composite Group had an authorized strength of 225 officers and 1,542 enlisted men, almost all of whom eventually deployed to Tinian. In addition to its authorized strength,

46989-467: Was carried out. Two different types of bombs were eventually developed: a gun-type fission weapon that used uranium-235, called Little Boy , and a more complex implosion-type nuclear weapon that used plutonium-239, called Fat Man . There was a Japanese nuclear weapon program , but it lacked the human, mineral, and financial resources of the Manhattan Project, and never made much progress towards developing an atomic bomb. The 509th Composite Group

47216-501: Was chosen to allow for Olympic to complete its objectives, for troops to be redeployed from Europe, and the Japanese winter to pass. Japan's geography made this invasion plan obvious to the Japanese; they were able to predict the Allied invasion plans accurately and thus adjust their defensive plan, Operation Ketsugō , accordingly. The Japanese planned an all-out defense of Kyūshū, with little left in reserve. In all, there were 2.3 million Japanese Army troops prepared to defend

47443-468: Was completed on 15 June, and the target insert on 24 July. The projectile and eight bomb pre-assemblies (partly assembled bombs without the powder charge and fissile components) left Hunters Point Naval Shipyard , California, on 16 July aboard the cruiser USS  Indianapolis , and arrived on Tinian on 26 July. The target insert followed by air on 30 July, accompanied by Commander Francis Birch from Project Alberta. Responding to concerns expressed by

47670-399: Was constituted on 9 December 1944, and activated on 17 December 1944, at Wendover Army Air Field , Utah, commanded by Colonel Paul Tibbets . Tibbets was assigned to organize and command a combat group to develop the means of delivering an atomic weapon against targets in Germany and Japan. Because the flying squadrons of the group consisted of both bomber and transport aircraft, the group

47897-449: Was contingent upon German economic recovery. One month later, Truman signed the National Security Act of 1947 , creating a unified Department of Defense , the Central Intelligence Agency (CIA), and the National Security Council (NSC). These would become the main bureaucracies for US defense policy in the Cold War. Stalin believed economic integration with the West would allow Eastern Bloc countries to escape Soviet control, and that

48124-409: Was designated as a "composite" rather than a "bombardment" unit. Due to its remoteness, Tibbets selected Wendover for his training base over Great Bend, Kansas and Mountain Home, Idaho . Each bombardier completed at least 50 practice drops of inert or conventional explosive pumpkin bombs , targeting islands around Tinian and later the Japanese home islands, until as late as 14 August 1945. Some of

48351-402: Was generally thought to have declined. Since then, concern over nuclear weapons has shifted to the prevention of localized nuclear conflicts resulting from nuclear proliferation , and the threat of nuclear terrorism . However, the threat of nuclear war is considered to have resurged after the Russian invasion of Ukraine , particularly with regard to Russian threats to use nuclear weapons during

48578-402: Was kept highly secret even from policymakers until the Moynihan Commission in 1995. Despite this, the decryption project had already been betrayed and dispatched to the USSR by Kim Philby and Bill Weisband in 1946, as was discovered by the US by 1950. Nonetheless, the Soviets had to keep their discovery of the program secret, too, and continued leaking their own information, some of which

48805-454: Was left as the world's sole superpower. In February 1946, George F. Kennan 's " Long Telegram " from Moscow to Washington helped to articulate the US government's increasingly hard line against the Soviets, which would become the basis for US strategy toward the Soviet Union for the duration of the Cold War. The telegram galvanized a policy debate that would eventually shape the Truman administration 's Soviet policy. Washington's opposition to

49032-492: Was more or less a deliberate copy of the Fat Man plutonium device. In the same year the first US-Soviet nuclear war plan was penned in the US with Operation Dropshot . With the monopoly over nuclear technology broken, worldwide nuclear proliferation accelerated. The United Kingdom tested its first independent atomic bomb in 1952, followed by France developing its first atomic bomb in 1960 and then China developing its first atomic bomb in 1964. While much smaller than

49259-488: Was now restricted to the island of Taiwan , the nationalist government of which exists to this day. The Kremlin promptly created an alliance with the newly formed People's Republic of China. According to Norwegian historian Odd Arne Westad , the communists won the Civil War because they made fewer military mistakes than Chiang Kai-Shek made, and because in his search for a powerful centralized government, Chiang antagonized too many interest groups in China. Moreover, his party

49486-403: Was parity in the quantity and quality of secret information obtained by each side. However, the Soviets probably had an advantage in terms of HUMINT (human intelligence or interpersonal espionage) and "sometimes in its reach into high policy circles." In terms of decisive impact, however, he concludes: We also can now have high confidence in the judgment that there were no successful "moles" at

49713-539: Was particularly exacerbated by the fact that such weapons at sea were not constrained by the safeguards provided by the Permissive Action Link attached to U.S. Air Force and Army nuclear weapons. It is unknown if the navies of the other nuclear powers yet today deploy tactical nuclear weapons at sea. The 2018 US Nuclear Posture Review emphasised the need for the US to have sub-strategic nuclear weapons as additional layers for its nuclear deterrence. Nuclear terrorism by non-state organizations or actors (even individuals)

49940-476: Was presented as an ultimatum and stated that without a surrender, the Allies would attack Japan, resulting in "the inevitable and complete destruction of the Japanese armed forces and just as inevitably the utter devastation of the Japanese homeland". The atomic bomb was not mentioned in the communiqué. On 28 July, Japanese papers reported that the declaration had been rejected by the Japanese government. That afternoon, Prime Minister Kantarō Suzuki declared at

50167-427: Was still useful to the American program. According to Moynihan, even President Truman may not have been fully informed of Venona, which may have left him unaware of the extent of Soviet espionage. Clandestine atomic spies from the Soviet Union, who infiltrated the Manhattan Project at various points during WWII, played a major role in increasing tensions that led to the Cold War. In addition to usual espionage,

50394-406: Was subject to the following criteria: These cities were largely untouched during the nightly bombing raids, and the Army Air Forces agreed to leave them off the target list so accurate assessment of the damage caused by the atomic bombs could be made. Hiroshima was described as "an important army depot and port of embarkation in the middle of an urban industrial area. It is a good radar target and it

50621-457: Was the Korean War of 1950 to 1953, which ended in stalemate. The Cuban Revolution of 1959 installed the first communist regime in the Western Hemisphere, and in 1962, the Cuban Missile Crisis began after deployments of U.S. missiles in Europe and Soviet missiles in Cuba; it is considered the closest the Cold War came to escalating into nuclear war . Another major proxy conflict was the Vietnam War of 1955 to 1975, which ended in defeat for

50848-431: Was turned down by the Western powers. Some sources dispute the sincerity of the proposal. Britain, France, the United States, Canada and eight other western European countries signed the North Atlantic Treaty of April 1949, establishing the North Atlantic Treaty Organization (NATO). That August, the first Soviet atomic device was detonated in Semipalatinsk , Kazakh SSR . Following Soviet refusals to participate in

51075-447: Was unable to stop the Allied attacks and the country's civil defense preparations proved inadequate. Japanese fighters and anti-aircraft guns had difficulty engaging bombers flying at high altitude. From April 1945, the Japanese interceptors also had to face American fighter escorts based on Iwo Jima and Okinawa. That month, the Imperial Japanese Army Air Service and Imperial Japanese Navy Air Service stopped attempting to intercept

51302-431: Was unclear. Presumably, the United States hoped atomic weapons could offset the Soviet Union's larger conventional ground forces in Eastern Europe , and possibly be used to pressure Soviet leader Joseph Stalin into making concessions. Under Stalin, the Soviet Union pursued its own atomic capabilities through a combination of scientific research and espionage directed against the American program. The Soviets believed that

51529-434: Was weakened during the war against Japan . Meanwhile, the communists told different groups, such as the peasants, exactly what they wanted to hear, and they cloaked themselves under the cover of Chinese nationalism . Confronted with the communist revolution in China and the end of the American atomic monopoly in 1949, the Truman administration quickly moved to escalate and expand its containment doctrine. In NSC 68 ,

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