126-552: The Medical Repository was the first American medical journal , founded in 1797 and published quarterly, with some interruptions, through 1824. It was printed by T. & J. Swords, printers to the physics faculty at Columbia College in New York City . The journal's founding editors were Elihu Hubbard Smith , Samuel L. Mitchill , and Edward Miller. Smith edited the journal until his death in 1798, and Miller until his death in 1812, with Mitchill leaving his editorship after 1821;
252-562: A " Special Relationship " with the United Kingdom and strong ties with Canada , Australia , New Zealand , the Philippines , Japan , South Korea , Israel , and several European Union countries ( France , Italy , Germany , Spain , and Poland ). The U.S. works closely with its NATO allies on military and national security issues, and with countries in the Americas through
378-500: A "Person held to Service or Labor." In addition, Article 1, section 9, clause 1 of the Constitution prohibited Congress from abolishing the importation of slaves , but in a compromise, the prohibition could be lifted by Congress in 20 years, and slaves were referred to as "Persons." The Act Prohibiting Importation of Slaves passed easily in 1807 and took effect on January 1, 1808. However, the ban on importation spurred an expansion in
504-613: A congressional veto over federal policy with regard to slavery and other issues important to the South. As a result of this preoccupation, slave states and free states were often admitted into the Union in opposite pairs to maintain the existing Senate balance between slave and free states. Controversy over whether Missouri should be admitted as a slave state resulted in the Missouri Compromise of 1821, which specified that territory acquired in
630-430: A constitutional convention on March 10, 1864. Arkansas, part of which came under Union control by 1864, adopted an anti-slavery constitution on March 16, 1864. Louisiana – much of which had been under Union control since 1862 – abolished slavery through a new state constitution approved by voters September 5, 1864. The border states of Maryland (November 1, 1864) and Missouri (January 11, 1865) abolished slavery before
756-572: A decentralized government that operated until 1789. After the British surrender at the siege of Yorktown in 1781 American sovereignty was internationally recognized by the Treaty of Paris (1783), through which the U.S. gained territory stretching west to the Mississippi River, north to present-day Canada, and south to Spanish Florida . The Northwest Ordinance (1787) established the precedent by which
882-746: A federal capital district, Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the states of Alaska to the northwest and the archipelagic Hawaii in the Pacific Ocean . The United States also asserts sovereignty over five major island territories and various uninhabited islands . The country has the world's third-largest land area , largest exclusive economic zone , and third-largest population , exceeding 334 million. Its three largest metropolitan areas are New York , Los Angeles , and Chicago , and its three most populous states are California , Texas , and Florida . Paleo-Indians migrated across
1008-407: A few prominent industrialists , largely by their formation of trusts and monopolies to prevent competition. Tycoons led the nation's expansion in the railroad , petroleum , and steel industries. The United States emerged as a pioneer of the automotive industry . These changes were accompanied by significant increases in economic inequality , slum conditions , and social unrest , creating
1134-644: A global reach. The U.S. is a founding member of the World Bank , Organization of American States , NATO , and the United Nations , as well as a permanent member of the UN Security Council . The first documented use of the phrase "United States of America" is a letter from January 2, 1776. Stephen Moylan , a Continental Army aide to General George Washington , wrote to Joseph Reed , Washington's aide-de-camp , seeking to go "with full and ample powers from
1260-535: A period of heightened, overt racism following Reconstruction, a time often called the nadir of American race relations . A series of Supreme Court decisions, including Plessy v. Ferguson , emptied the Fourteenth and Fifteenth Amendments of their force, allowing Jim Crow laws in the South to remain unchecked, sundown towns in the Midwest, and segregation in communities across the country , which would be reinforced by
1386-488: A prominent leader in the early 1960s. The Great Society plan of President Lyndon Johnson 's administration resulted in groundbreaking and broad-reaching laws, policies and a constitutional amendment to counteract some of the worst effects of lingering institutional racism . The counterculture movement in the U.S. brought significant social changes, including the liberalization of attitudes toward recreational drug use and sexuality . It also encouraged open defiance of
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#17330854286241512-560: A rapid increase in population in the decades prior to the American Revolution . Organized political and social movements to abolish slavery began in the mid-18th century. The sentiments of the American Revolution and the promise of equality evoked by the Declaration of Independence stood in contrast to the status of most black people, either free or enslaved, in the colonies. Despite this, thousands of black Americans fought for
1638-518: A sense of manifest destiny . The Missouri Compromise attempted to balance the desire of northern states to prevent the expansion of slavery into new territories with that of southern states to extend it, admitting Missouri as a slave state and Maine as a free state. It further prohibited slavery in all other lands of the Louisiana Purchase north of the 36°30′ parallel . As Americans expanded further into land inhabited by Native Americans,
1764-532: A slave did not become free by entering a free state and must be returned to their owner. Enforcement of these laws became one of the controversies which arose between slave and free states. Slavery, in what would become the United States, was established as part of European colonization . By the 18th century, slavery was legal throughout the Thirteen Colonies , after which rebel colonies started to abolish
1890-595: A state in 1791. Slavery was a divisive issue in the United States. It was a major issue during the writing of the U.S. Constitution in 1787, the subject of political crises in the Missouri Compromise of 1820 and the Compromise of 1850 and was the primary cause of the American Civil War in 1861. Just before the Civil War, there were 19 free states and 15 slave states. The most recent free state, Kansas , had entered
2016-695: A state until 1896, as an organized territory , Utah legalized slavery under the 1852 territorial Act in Relation to Service and similar Act for the Relief of Indian Slaves and Prisoners . Brigham Young and his group of Mormon pioneers had arrived in Utah in 1847, during the Mexican–American War , when Utah Territory was Mexican territory. They ignored the Mexican ban on slavery. They viewed slavery as consistent with
2142-559: A statehood bill to Congress to create a new state from 48 counties in western Virginia. The new state would eventually incorporate 50 counties. The issue of slavery in the new state delayed approval of the bill. In the Senate Charles Sumner objected to the admission of a new slave state, while Benjamin Wade defended statehood as long as a gradual emancipation clause would be included in the new state constitution. Two senators represented
2268-401: A year). Juvenile correctional facilities are operated by local or state governments and serve as longer-term placements for any minor adjudicated as delinquent and ordered by a judge to be confined. As of January 2023, the United States has the sixth-highest per capita incarceration rate in the world—531 people per 100,000 inhabitants—and the largest prison and jail population in
2394-509: Is a stub . You can help Misplaced Pages by expanding it . See tips for writing articles about academic journals . Further suggestions might be found on the article's talk page . United States The United States of America ( USA ), commonly known as the United States ( U.S. ) or America , is a country primarily located in North America . It is a federal union of 50 states and
2520-571: Is believed to be the first widespread culture in the Americas. Over time, indigenous North American cultures grew increasingly sophisticated, and some, such as the Mississippian culture , developed agriculture , architecture , and complex societies . In the post-archaic period , the Mississippian cultures were located in the midwestern , eastern , and southern regions, and the Algonquian in
2646-492: Is known as the presidential system , in contrast to the parliamentary system , where the executive is part of the legislative body. Many countries around the world imitated this aspect of the 1789 Constitution of the United States , especially in the Americas. The Constitution is silent on political parties. However, they developed independently in the 18th century with the Federalist and Anti-Federalist parties. Since then,
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#17330854286242772-438: Is now the United States experienced conflicts with Native Americans, they also engaged in trade, exchanging European tools for food and animal pelts. Relations ranged from close cooperation to warfare and massacres. The colonial authorities often pursued policies that forced Native Americans to adopt European lifestyles, including conversion to Christianity. Along the eastern seaboard, settlers trafficked African slaves through
2898-542: Is the federal agency charged with addressing most environmental-related issues . The idea of wilderness has shaped the management of public lands since 1964, with the Wilderness Act . The Endangered Species Act of 1973 provides a way to protect threatened and endangered species and their habitats. The United States Fish and Wildlife Service implements and enforces the Act. In 2024, the U.S. ranked 34th among 180 countries in
3024-569: The Allies , helping to turn the tide against the Central Powers . In 1920, a constitutional amendment granted nationwide women's suffrage . During the 1920s and '30s, radio for mass communication and the invention of early television transformed communications nationwide. The Wall Street Crash of 1929 triggered the Great Depression , which President Franklin D. Roosevelt responded to with
3150-548: The Atlantic slave trade . The original Thirteen Colonies that would later found the United States were administered as possessions of Great Britain , and had local governments with elections open to most white male property owners . The colonial population grew rapidly, eclipsing Native American populations; by the 1770s, the natural increase of the population was such that only a small minority of Americans had been born overseas. The colonies' distance from Britain allowed for
3276-653: The Bering land bridge more than 12,000 years ago, and formed various civilizations and societies . British colonization led to the first settlement of the Thirteen Colonies in Virginia in 1607. Clashes with the British Crown over taxation and political representation sparked the American Revolution , with the Second Continental Congress formally declaring independence on July 4, 1776. Following its victory in
3402-484: The Compromise of 1850 . Three more free states were admitted in the final years before the Civil War, disrupting the balance that the slave states had tried to maintain. The American Civil War (1861–1865) disrupted and eventually ended slavery. Eleven slave states joined the Confederacy , while the border states of Delaware, Maryland, Kentucky, and Missouri – all slave states – remained in
3528-529: The Environmental Performance Index . The country joined the Paris Agreement on climate change in 2016 and has many other environmental commitments. The United States is a federal republic of 50 states and a separate federal capital district, Washington, D.C. It also asserts sovereignty over five unincorporated territories and several uninhabited island possessions . The U.S. is
3654-493: The Federal Bureau of Investigation (FBI) and the U.S. Marshals Service have national jurisdiction and specialized duties, such as protecting civil rights , national security and enforcing U.S. federal courts ' rulings and federal laws. State courts conduct most civil and criminal trials, and federal courts handle designated crimes and appeals of state court decisions . There is no unified "criminal justice system" in
3780-688: The Great Lakes , Mississippi River and Gulf of Mexico . British colonization of the East Coast began with the Virginia Colony (1607) and Plymouth Colony (1620). The Mayflower Compact and the Fundamental Orders of Connecticut established precedents for representative self-governance and constitutionalism that would develop throughout the American colonies. While European settlers in what
3906-701: The Great Lakes region and along the Eastern Seaboard , while the Hohokam culture and Ancestral Puebloans inhabited the southwest . Native population estimates of what is now the United States before the arrival of European immigrants range from around 500,000 to nearly 10 million. Christopher Columbus began exploring the Caribbean for Spain in 1492, leading to Spanish-speaking settlements and missions from Puerto Rico and Florida to New Mexico and California . France established its own settlements along
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4032-583: The House of Representatives , a lower house based on population; and the Senate , an upper house based on equal representation for each state. Federalism provides substantial autonomy to the 50 states, while American values are based on a democratic political tradition that draws its inspiration from the European Enlightenment movement . One of the world's most developed countries , the United States has had
4158-472: The Louisiana Purchase north of latitude 36° 30', which described most of Missouri's southern border, would, except for Missouri, become free states, and territory south of that line would become slave states. As part of the compromise, Maine , on August 19, 1821, was admitted as a free state. The admission of Texas (1845) and the acquisition of the vast new Mexican Cession territories (1848), after
4284-508: The Mexican–American War , created further north–south conflict. Although the settled portion of Texas was an area rich in cotton plantations and dependent on slave labor, the territory acquired in the Mountain West did not seem hospitable to cotton or slavery. As part of the Compromise of 1850 , California was admitted as a free state without a slave state being admitted; California's admission also meant there would be no slave state on
4410-580: The Midwest . At the same time, about one million French Canadians migrated from Quebec to New England . During the Great Migration , millions of African Americans left the rural South for urban areas in the North. Alaska was purchased from Russia in 1867. The Compromise of 1877 effectively ended Reconstruction and white supremacists took local control of Southern politics . African Americans endured
4536-672: The National Park Service and other agencies. About 28% of the country's land is publicly owned and federally managed, primarily in the Western States . Most of this land is protected , though some is leased for commercial use, and less than one percent is used for military purposes. Environmental issues in the United States include debates on non-renewable resources and nuclear energy , air and water pollution , biodiversity , logging and deforestation , and climate change . The U.S. Environmental Protection Agency (EPA)
4662-634: The New Deal , a series of sweeping programs and public works projects combined with financial reforms and regulations . All were intended to protect against future economic depressions. Initially neutral during World War II , the U.S. began supplying war materiel to the Allies of World War II in March 1941 and entered the war in December after the Empire of Japan 's attack on Pearl Harbor . The U.S. developed
4788-759: The Organization of American States and the United States–Mexico–Canada Free Trade Agreement . In South America, Colombia is traditionally considered to be the closest ally of the United States. The U.S. exercises full international defense authority and responsibility for Micronesia , the Marshall Islands , and Palau through the Compact of Free Association . It has increasingly conducted strategic cooperation with India , but its ties with China have steadily deteriorated. Since 2014,
4914-662: The Patriot cause for a combination of reasons. Thousands also joined the British, encouraged by offers of freedom such as the Philipsburg Proclamation . In the 1770s, enslaved black people throughout New England began sending petitions to northern legislatures demanding freedom. 5 Northern states adopted policies to at least gradually abolish slavery : Pennsylvania in 1780, New Hampshire and Massachusetts in 1783, and Connecticut and Rhode Island in 1784. The Republic of Vermont had limited slavery in 1777, while it
5040-638: The Pentium microprocessor in accordance with Moore's law , rechargeable lithium-ion batteries , the first gene therapy trial, and cloning either emerged in the U.S. or were improved upon there. The Human Genome Project was formally launched in 1990, while Nasdaq became the first stock market in the United States to trade online in 1998. In the Gulf War of 1991, an American-led international coalition of states expelled an Iraqi invasion force that had occupied neighboring Kuwait . The September 11 attacks on
5166-529: The Senate , where each state was represented by two senators. With an equal number of slave states and free states, the Senate was equally divided on issues important to the South . As the population of the free states began to outstrip the population of the slave states, leading to control of the House of Representatives by free states, the Senate became the preoccupation of slave-state politicians interested in maintaining
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5292-523: The Soviet Union's collapse and the end of the Cold War in 1991, the U.S. emerged as the world's sole superpower , wielding significant geopolitical influence globally . The U.S. national government is a presidential constitutional federal republic and liberal democracy with three separate branches : legislative , executive , and judicial . It has a bicameral national legislature composed of
5418-576: The Spanish–American War . (The Philippines was granted full independence from the U.S. on July 4, 1946, following World War II. Puerto Rico and Guam have remained U.S. territories.) American Samoa was acquired by the United States in 1900 after the Second Samoan Civil War . The U.S. Virgin Islands were purchased from Denmark in 1917. The United States entered World War I alongside
5544-647: The U.S. Constitution was ratified, had prohibited slavery in the federal Northwest Territory . The southern boundary of the territory was the Ohio River , which was regarded as a westward extension of the Mason-Dixon line . The territory was generally settled by New Englanders and American Revolutionary War veterans granted land there. The 6 states created from the territory were all free states: Ohio (1803), Indiana (1816), Illinois (1818), Michigan (1837), Wisconsin (1848), and Minnesota (1858). By 1815,
5670-622: The cotton gin made the institution increasingly profitable for Southern elites . This sectional conflict regarding slavery culminated in the American Civil War (1861–1865). Eleven slave states seceded and formed the Confederate States of America , while the other states remained in the Union . War broke out in April 1861 after the Confederates bombarded Fort Sumter . After
5796-517: The domestic slave trade , which remained legal until slavery was banned entirely in 1865 by the 13th Amendment . In the late 1850s, an unsuccessful campaign was launched by several southern states to resume the international slave trade, to restock their slave populations, but this met with strong opposition. However, there was a large natural increase in the slave population throughout the late 18th and 19th centuries, while some illegal smuggling of African slaves continued via Spanish Cuba . One of
5922-524: The fall of communism and the collapse of the Soviet Union , which marked the end of the Cold War and left the United States as the world's sole superpower . The 1990s saw the longest recorded economic expansion in American history , a dramatic decline in U.S. crime rates , and advances in technology . Throughout this decade, technological innovations such as the World Wide Web , the evolution of
6048-419: The highest disposable household income per capita among OECD countries. As of February 2024, the total federal government debt was $ 34.4 trillion. Slave states and free states In the United States before 1865, a slave state was a state in which slavery and the internal or domestic slave trade were legal, while a free state was one in which they were prohibited. Between 1812 and 1850, it
6174-445: The largest nominal GDP since about 1890 and accounted for over 15% of the global economy in 2023. It possesses by far the largest amount of wealth of any country and has the highest disposable household income per capita among OECD countries. The U.S. ranks among the world's highest in economic competitiveness , productivity , innovation , human rights , and higher education . Its hard power and cultural influence have
6300-642: The 1775 Battles of Lexington and Concord , igniting the American Revolutionary War . At the Second Continental Congress , the colonies appointed George Washington commander-in-chief of the Continental Army , and created a committee that named Thomas Jefferson to draft the Declaration of Independence . Two days after passing the Lee Resolution to create an independent nation the Declaration
6426-408: The 1775–1783 Revolutionary War , the country continued to expand westward across North America , resulting in the dispossession of native inhabitants . As more states were admitted , a North–South division over slavery led to the secession of the Confederate States of America , which fought states remaining in the Union in the 1861–1865 American Civil War . With the victory and preservation of
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#17330854286246552-407: The 1840 census (see Slavery in the United States#Abolitionism in the North ). In the South, Kentucky was created as a slave state from Virginia (1792), and Tennessee was created as a slave state from North Carolina (1796). By 1804, before the creation of new states from the federal western territories, the number of slave and free states was 8 each. By the time of Missouri Compromise of 1820,
6678-408: The 1850s, culminating in numerous skirmishes and devastation on both sides of the question. Nevertheless, the North prevented Kansas Territory from becoming a slave state, and when Southern members of Congress departed en masse in early 1861, Kansas was immediately admitted to the Union as a free state. When the admission of Minnesota proceeded unimpeded in 1858, the balance in the Senate ended; this
6804-466: The 2010s, political polarization in the country increased between liberal and conservative factions. This polarization was capitalized upon in the January 2021 Capitol attack , when a mob of insurrectionists entered the U.S. Capitol and sought to prevent the peaceful transfer of power in an attempted self-coup d'état . The United States is the world's third-largest country by total area behind Russia and Canada. The 48 contiguous states and
6930-426: The American West have an alpine climate . The climate is arid in the Southwest, Mediterranean in coastal California , and oceanic in coastal Oregon , Washington , and southern Alaska . Most of Alaska is subarctic or polar . Hawaii , the southern tip of Florida and U.S. territories in the Caribbean and Pacific are tropical . States bordering the Gulf of Mexico are prone to hurricanes, and most of
7056-420: The Declaration of Independence on July 4, 1776. The term "United States" and the initialism "U.S.", used as nouns or as adjectives in English, are common short names for the country. The initialism "USA", a noun, is also common. "United States" and "U.S." are the established terms throughout the U.S. federal government , with prescribed rules. In English, the term "America" rarely refers to topics unrelated to
7182-404: The District of Columbia occupy a combined area of 3,119,885 square miles (8,080,470 km ). The coastal plain of the Atlantic seaboard gives way to inland forests and rolling hills in the Piedmont plateau region. The Appalachian Mountains and the Adirondack massif separate the East Coast from the Great Lakes and the grasslands of the Midwest . The Mississippi River System ,
7308-510: The Elder concluded that major military resources needed to be devoted to North America to win the war against France. The British colonies' position as an integral part of the British Empire became more apparent during the war, with British military and civilian officials becoming a more significant presence in American life. Following their victory in the French and Indian War, Britain began to assert greater control over local colonial affairs, resulting in colonial political resistance ; one of
7434-465: The January 1863 Emancipation Proclamation , many freed slaves joined the Union army . The war began to turn in the Union's favor following the 1863 Siege of Vicksburg and Battle of Gettysburg , and the Confederacy surrendered in 1865 after the Union's victory in the Battle of Appomattox Court House . The Reconstruction era followed the war. After the assassination of President Abraham Lincoln , Reconstruction Amendments were passed to protect
7560-496: The Mormon view on Black people. On June 19, 1862, fulfilling a part of his 1860 campaign platform, President Lincoln signed the law ending slavery in Utah Territory and all other territories. While California's state constitution outlawed slavery, the 1850 Act for the Government and Protection of Indians allowed the indenture of Native Californians. This law provided for apprenticing or indenturing Indian children to Whites, and also punished vagrant Indians by hiring them out to
7686-704: The Pacific coast. To avoid creating a free state majority in the Senate, California agreed to send one pro-slavery and one anti-slavery senator to Congress. The difficulty of identifying territory that could be organized into additional slave states stalled the process of opening the western territories to settlement. Slave-state politicians made efforts to annex Cuba (see: Lopez Expedition and Ostend Manifesto , 1852) and Nicaragua (see: Filibuster War , 1856–57), with intentions to create new slave states. Parts of Northern Mexico were also coveted, with Senator Albert Brown declaring "I want Tamaulipas , Potosi , and one or two other Mexican States ; and I want them all for
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#17330854286247812-476: The Rocky Mountains, the Yellowstone Caldera , is the continent's largest volcanic feature. In 2021, the United States had 8% of global permanent meadows and pastures and 10% of cropland. With its large size and geographic variety, the United States includes most climate types. East of the 100th meridian , the climate ranges from humid continental in the north to humid subtropical in the south. The western Great Plains are semi-arid . Many mountainous areas of
7938-418: The U.S. Congress. By the time the Emancipation Proclamation was issued in 1863, Tennessee was already under Union control. Accordingly, the Proclamation applied only in the 10 remaining Confederate states. During the war, abolition of slavery was required by President Abraham Lincoln for readmission of Confederate states. The U.S. Congress , after the departure of the powerful Southern contingent in 1861,
8064-451: The U.S. has become a key ally of Ukraine ; it has also provided the country with significant military equipment and other support in response to Russia's 2022 invasion . The president is the commander-in-chief of the United States Armed Forces and appoints its leaders, the secretary of defense and the Joint Chiefs of Staff . The Department of Defense , which is headquartered at the Pentagon near Washington, D.C., administers five of
8190-661: The U.S. territories." Despite disparate systems of confinement, four main institutions dominate: federal prisons , state prisons , local jails, and juvenile correctional facilities . Federal prisons are run by the Federal Bureau of Prisons and hold people who have been convicted of federal crimes, including pretrial detainees. State prisons, run by the official department of correction of each state, hold sentenced people serving prison time (usually longer than one year) for felony offenses. Local jails are county or municipal facilities that incarcerate defendants prior to trial; they also hold those serving short sentences (typically under
8316-427: The Union after its own years-long bloody fight over slavery. During the war, slavery was abolished in some of the slave states, and the Thirteenth Amendment to the United States Constitution , ratified in December 1865, abolished slavery throughout the United States, except as punishment for a crime. Slavery was established as a legal institution in each of the Thirteen Colonies , starting from 1619 on wards with
8442-413: The Union, although Kentucky and Missouri also had competing Confederate state governments. In 1863 western Virginia, much of which had remained loyal to the Union, was admitted as the new state of West Virginia with a commitment to gradual emancipation. The following year Nevada , a free state in the West, was also admitted. During the Civil War, a Unionist government in Wheeling, Virginia , presented
8568-399: The Unionist Virginia government, John S. Carlile and Waitman T. Willey . Senator Carlile objected that Congress had no right to impose emancipation on West Virginia , while Willey proposed a compromise amendment to the state constitution for gradual abolition. Sumner attempted to add his own amendment to the bill, which was defeated, and the statehood bill passed both houses of Congress with
8694-402: The United States and the peaceful transfer of power . The Louisiana Purchase of 1803 from France nearly doubled the territory of the United States. Lingering issues with Britain remained , leading to the War of 1812 , which was fought to a draw. Spain ceded Florida and its Gulf Coast territory in 1819. In the late 18th century, American settlers began to expand westward , many with
8820-541: The United States entered the Cold War, where geopolitical tensions between the U.S. and the Soviet Union led the two countries to dominate world affairs . The U.S. utilized the policy of containment to limit the USSR's sphere of influence, and prevailed in the Space Race , which culminated with the first crewed Moon landing in 1969. Domestically, the U.S. experienced economic growth , urbanization , and population growth following World War II . The civil rights movement emerged, with Martin Luther King Jr. becoming
8946-495: The United States has operated as a de facto two-party system , though the parties in that system have been different at different times. The two main national parties are presently the Democratic and the Republican . The former is perceived as relatively liberal in its political platform while the latter is perceived as relatively conservative . In the American federal system , sovereign powers are shared between two levels of elected government: national and state. People in
9072-572: The United States in 2001 by the pan-Islamist militant organization al-Qaeda led to the war on terror , and subsequent military interventions in Afghanistan and Iraq . The cultural impact of the attacks was profound and long-lasting. The U.S. housing bubble culminated in 2007 with the Great Recession , the largest economic contraction since the Great Depression. Coming to a head in
9198-578: The United States of America to Spain" to seek assistance in the Revolutionary War effort. The first known public usage is an anonymous essay published in the Williamsburg newspaper, The Virginia Gazette , on April 6, 1776. By June 1776, the "United States of America" appeared in the Articles of Confederation and the Declaration of Independence . The Second Continental Congress adopted
9324-591: The United States, slavery was abolished nationally . By 1900, the country had established itself as a great power , a status solidified after its involvement in World War I . After Japan 's attack on Pearl Harbor in December 1941, the U.S. entered World War II . Its aftermath left the U.S. and the Soviet Union as the world's two superpowers and led to the Cold War , during which both countries struggled for ideological dominance and international influence . Following
9450-532: The United States, despite the usage of "the Americas " as the totality of North and South America. "The States" is an established colloquial shortening of the name, used particularly from abroad; "stateside" is the corresponding adjective or adverb. The first inhabitants of North America migrated from Siberia across the Bering land bridge about 12,000 years ago; the Clovis culture , which appeared around 11,000 BC,
9576-605: The United States, except Iran , North Korea , and Bhutan . Though Taiwan does not have formal diplomatic relations with the U.S., it maintains close unofficial relations. The United States regularly supplies Taiwan with military equipment to deter potential Chinese aggression. Its geopolitical attention also turned to the Indo-Pacific when the United States joined the Quadrilateral Security Dialogue with Australia, India, and Japan. The United States has
9702-509: The United States. The American prison system is largely heterogenous, with thousands of relatively independent systems operating across federal, state, local, and tribal levels. In 2023, "these systems [held] almost 2 million people in 1,566 state prisons, 98 federal prisons, 3,116 local jails, 1,323 juvenile correctional facilities, 181 immigration detention facilities, and 80 Indian country jails, as well as in military prisons , civil commitment centers, state psychiatric hospitals, and prisons in
9828-613: The West Virginia legislature completely abolished slavery, and also ratified the 13th Amendment on February 3, 1865. In the District of Columbia , formed with land from two slave states, Maryland and Virginia, the trade was abolished by the Compromise of 1850 . So as to avoid losing the profitable slave-trading businesses in Alexandria (one was Franklin and Armfield ), Alexandria County, D.C., requested that it be returned to Virginia, where
9954-969: The addition of what became known as the Willey Amendment. President Lincoln signed the bill on December 31, 1862. Voters in western Virginia approved the Willey Amendment on March 26, 1863. President Lincoln had issued the Emancipation Proclamation on January 1, 1863, which exempted from emancipation the border states (four slave states loyal to the Union ) as well as some territories occupied by Union forces within Confederate states. Two additional counties were added to West Virginia in late 1863, Berkeley and Jefferson . The slaves in Berkeley were also under exemption but not those in Jefferson County. As of
10080-499: The arrival of "twenty and odd" enslaved Africans in Virginia . Although indigenous peoples were also sold into slavery, the vast majority of the enslaved population consisted of Africans brought to the Americas via the Atlantic slave trade . Due to a lower prevalence of tropical diseases and better treatment , the enslaved population in the colonies had a higher life expectancy than in the West Indies and South America, leading to
10206-427: The census of 1860, the 49 exempted counties held some 6000 slaves over 21 years of age who would not have been emancipated, about 40% of the total slave population. The terms of the Willey Amendment only freed children, at birth or as they came of age, and prohibited the importation of slaves. West Virginia became the 35th state on June 20, 1863, and the last slave state admitted to the Union. Eighteen months later,
10332-453: The contiguous United States are in the State of California, about 84 miles (135 km) apart. At an elevation of 20,310 feet (6,190.5 m), Alaska's Denali is the highest peak in the country and continent. Active volcanoes are common throughout Alaska's Alexander and Aleutian Islands , and Hawaii consists of volcanic islands. The supervolcano underlying Yellowstone National Park in
10458-549: The country's GDP. The U.S. has 42% of the world's nuclear weapons —the second-largest share after Russia. The United States has the third-largest combined armed forces in the world, behind the Chinese People's Liberation Army and Indian Armed Forces . The military operates about 800 bases and facilities abroad, and maintains deployments greater than 100 active duty personnel in 25 foreign countries. State defense forces (SDFs) are military units that operate under
10584-464: The country's territory would expand with the admission of new states , rather than the expansion of existing states. The U.S. Constitution was drafted at the 1787 Constitutional Convention to overcome the limitations of the Articles. It went into effect in 1789, creating a federal republic governed by three separate branches that together ensured a system of checks and balances . George Washington
10710-699: The development of self-governance, and the First Great Awakening , a series of Christian revivals , fueled colonial interest in religious liberty . For a century, the American colonists had been providing their own troops and materiel in conflicts with indigenous peoples allied with Britain's colonial rivals , especially France, and the Americans had begun to develop a sense of self-defense and self-reliance separate from Britain. The French and Indian War (1754–1763) took on new significance for all North American colonists after Parliament under William Pitt
10836-494: The dividing line between the slave and free states was called the Mason-Dixon line (between Maryland and Pennsylvania), with its westward extension being the Ohio River . The 1787 Constitutional Convention debated slavery, and for a time slavery was a major impediment to passage of the new constitution . As a compromise, slavery was acknowledged but never mentioned explicitly in the Constitution. The Fugitive Slave Clause , Article 4, section 2, clause 3, for example, refers to
10962-564: The environment for labor unions to begin to flourish . This period eventually ended with the advent of the Progressive Era , which was characterized by significant reforms. Pro-American elements in Hawaii overthrew the Hawaiian monarchy ; the islands were annexed in 1898. That same year, Puerto Rico , the Philippines , and Guam were ceded to the U.S. by Spain after the latter's defeat in
11088-527: The federal government often applied policies of Indian removal or assimilation . The Trail of Tears (1830–1850) was a U.S. government policy that forcibly removed and displaced most Native Americans living east of the Mississippi River to lands far to the west. These and earlier organized displacements prompted a long series of American Indian Wars west of the Mississippi. The Republic of Texas
11214-399: The final volumes were edited by James R. Manley and Charles Drake. The journal filled a vacuum in medical literature in the early United States, as most medical publications were European and difficult to obtain; the great demand for the journal is attested by the fact that its first two volumes were each reprinted twice, in 1800 and 1804. This article about a general medical journal
11340-590: The first nuclear weapons and used them against the Japanese cities of Hiroshima and Nagasaki in August 1945, ending the war. The United States was one of the " Four Policemen " who met to plan the post-war world , alongside the United Kingdom , Soviet Union , and China . The U.S. emerged relatively unscathed from the war, with even greater economic power and international political influence . After World War II,
11466-508: The highest bidder at a public auction if the Indian could not provide sufficient bond or bail. The new settlers took 10,000 to 27,000 California Native Americans as forced laborers, including 4,000 to 7,000 children. In April 1863, after the declaration of the Emancipation Proclamation , the California legislature abolished all forms of legal indenture and apprenticeship for Native Americans. At
11592-505: The importation of slaves. In 1863, voters approved the Willey Amendment, which provided for gradual abolition of slavery, with the last enslaved people scheduled to be freed in 1884. On February 3, 1865, the state legislature approved immediate abolition. The Restored Government of Virginia – the Unionist government that governed the limited territory then under Union control that had not left to form West Virginia – voted to end slavery at
11718-463: The integration of Army National Guard units and personnel into the U.S. Army and (since 1947) the U.S. Air Force. There are about 18,000 U.S. police agencies from local to national level in the United States. Law in the United States is mainly enforced by local police departments and sheriff departments in their municipal or county jurisdictions. The state police departments have authority in their respective state , and federal agencies such as
11844-477: The military draft (leading to the end of conscription in 1973) and wide opposition to U.S. intervention in Vietnam (with the U.S. totally withdrawing in 1975). A societal shift in the roles of women was significantly responsible for the large increase in female paid labor participation during the 1970s, and by 1985 the majority of American women aged 16 and older were employed. The late 1980s and early 1990s saw
11970-411: The momentum for antislavery reform appeared to run out of steam, with half the states having already abolished slavery ( Northeast ), prohibited it from the start ( Midwest ), or committed to eliminating it, and half committed to continuing the institution indefinitely ( South ). The potential for political conflict over slavery at the federal level made politicians concerned about the balance of power in
12096-612: The most attractive to the population are the most vulnerable. The U.S. is one of 17 megadiverse countries containing large numbers of endemic species : about 17,000 species of vascular plants occur in the contiguous United States and Alaska, and over 1,800 species of flowering plants are found in Hawaii, few of which occur on the mainland. The United States is home to 428 mammal species, 784 birds, 311 reptiles, 295 amphibians , and around 91,000 insect species. There are 63 national parks , and hundreds of other federally managed parks, forests, and wilderness areas , managed by
12222-642: The most violent, the California genocide of thousands of Native inhabitants, lasted into the early 1870s, just as additional western territories and states were created. During the colonial period, slavery had been legal in the American colonies , though the practice began to be significantly questioned during the American Revolution. States in the North enacted abolition laws , though support for slavery strengthened in Southern states , as inventions such as
12348-494: The other compromises of the Constitution was the creation of the Three-Fifths Clause by which slave states acquired increased representation in the House of Representatives and Electoral College equivalent to 60% of their disenfranchised slave populations. Slave states had wanted 100% of their slaves to be counted, whereas Northern states argued that none should be. The Northwest Ordinance of 1787, passed just before
12474-408: The policy of redlining later adopted by the federal Home Owners' Loan Corporation . An explosion of technological advancement accompanied by the exploitation of cheap immigrant labor led to rapid economic expansion during the late 19th and early 20th centuries , allowing the United States to outpace the economies of England, France, and Germany combined. This fostered the amassing of power by
12600-490: The practice. Pennsylvania abolished slavery in 1780, and about half of the states had abolished slavery by the end of the Revolutionary War or in the first decades of the new country, although this did not always mean that existing slaves became free. Vermont — having declared its independence from Britain in 1777 and thus not being one of the Thirteen Colonies — banned slavery in the same year, before being admitted as
12726-553: The primary colonial grievances was a denial of their rights as Englishmen , particularly the right to representation in the British government that taxed them . To demonstrate their dissatisfaction and resolve, the First Continental Congress met in 1774 and passed the Continental Association , a colonial boycott of British goods that proved effective. The British attempt to then disarm the colonists resulted in
12852-565: The rights of African Americans . National infrastructure, including transcontinental telegraph and railroads , spurred growth in the American frontier . From 1865 through 1917 an unprecedented stream of immigrants arrived in the United States, including 24.4 million from Europe. Most came through the port of New York City , and New York City and other large cities on the East Coast became home to large Jewish , Irish , and Italian populations, while many Germans and Central Europeans moved to
12978-596: The rocky Great Basin and Chihuahua , Sonoran , and Mojave deserts. In the northwest corner of Arizona , carved by the Colorado River over millions of years, is the Grand Canyon , a steep-sided canyon and popular tourist destination known for its overwhelming visual size and intricate, colorful landscape. The Sierra Nevada and Cascade mountain ranges run close to the Pacific coast . The lowest and highest points in
13104-591: The same reason – for the plantation and spreading of slavery". In 1854, the Missouri Compromise of 1820 was superseded by the Kansas–Nebraska Act , which allowed white male settlers in the new territories to determine, by vote ( popular sovereignty ), whether they would allow slavery within each territory. The result was that pro- and anti-slavery elements flooded into Kansas with the goal of voting slavery up or down, leading to bloody fighting . An effort
13230-563: The six service branches, which are made up of the U.S. Army , Marine Corps , Navy , Air Force , and Space Force . The Coast Guard is administered by the Department of Homeland Security in peacetime and can be transferred to the Department of the Navy in wartime. The United States spent $ 916 billion on its military in 2023, which is by far the largest amount of any country , making up 37% of global military spending and accounting for 3.4% of
13356-586: The slave trade was legal; this took place in 1847. Slavery in the District of Columbia remained legal until 1862, when, over strong opposition from slaveholding residents, Congress passed the DC Compensated Emancipation Act . Many former slaveholders in the District refused to obey the new law which required Congress to pass supplemental legislation in 1862 that allowed enslaved people to file petitions for their own freedom. Although it did not become
13482-528: The sole authority of a state government. SDFs are authorized by state and federal law but are under the command of the state's governor . They are distinct from the state's National Guard units in that they cannot become federalized entities. A state's National Guard personnel, however, may be federalized under the National Defense Act Amendments of 1933 , which created the Guard and provides for
13608-537: The start of the Civil War, there were 34 states in the United States, 15 of which were slave states. Eleven of these slave states, after conventions devoted to the topic, issued declarations of secession from the United States, created the Confederate States of America , and were represented in the Confederate Congress . The slave states that stayed in the Union – Maryland, Missouri, Delaware, and Kentucky (called border states ) – retained their representatives in
13734-543: The states are also represented by local elected governments , which are administrative divisions of the states. States are subdivided into counties or county equivalents , and further divided into municipalities . The District of Columbia is a federal district containing the U.S. capital, Washington, D.C. . The federal district is an administrative division of the federal government. Federally recognized tribes govern 326 Indian reservations . The United States has an established structure of foreign relations, and it has
13860-504: The structure and responsibilities of the national federal government and its relationship with the individual states. The U.S. Constitution is the world's oldest national constitution still in effect (from March 4, 1789). Composed of three branches, all headquartered in Washington, D.C., the federal government is the national government of the United States. It is regulated by a strong system of checks and balances . The three-branch system
13986-591: The war's end. The Union-occupied state of Tennessee abolished slavery by popular vote on a constitutional amendment that took effect February 22, 1865. However, slavery legally persisted in Delaware, Kentucky, and (to a very limited extent, due to a trade ban but continued gradual abolition) New Jersey, until the Thirteenth Amendment to the United States Constitution abolished slavery throughout
14112-565: The world's fourth-longest river system , runs predominantly north–south through the heart of the country. The flat and fertile prairie of the Great Plains stretches to the west, interrupted by a highland region in the southeast. The Rocky Mountains , west of the Great Plains, extend north to south across the country, peaking at over 14,000 feet (4,300 m) in Colorado . Farther west are
14238-567: The world's second-largest diplomatic corps as of 2024 . It is a permanent member of the United Nations Security Council , and home to the United Nations headquarters . The United States is a member of the G7 , G20 , and OECD intergovernmental organizations. Almost all countries have embassies and many have consulates (official representatives) in the country. Likewise, nearly all countries host formal diplomatic missions with
14364-444: The world's oldest surviving federation, and its presidential system of national government has been adopted, in whole or in part, by many newly independent states worldwide following their decolonization . It is a liberal representative democracy "in which majority rule is tempered by minority rights protected by law ". The Constitution of the United States serves as the country's supreme legal document , also establishing
14490-538: The world's tornadoes occur in the country , mainly in Tornado Alley . Overall, the United States receives more high-impact extreme weather incidents than any other country. Extreme weather became more frequent in the U.S. in the 21st century, with three times the number of reported heat waves as in the 1960s. In the American Southwest , droughts became more persistent and more severe. The regions considered as
14616-528: The world, with almost 2 million people incarcerated . An analysis of the World Health Organization Mortality Database from 2010 showed U.S. homicide rates "were 7 times higher than in other high-income countries, driven by a gun homicide rate that was 25 times higher". The U.S. has been the world's largest economy nominally since about 1890 . The 2023 nominal U.S. gross domestic product (GDP) of more than $ 27 trillion
14742-508: Was annexed in 1845, and the 1846 Oregon Treaty led to U.S. control of the present-day American Northwest . Victory in the Mexican–American War resulted in the 1848 Mexican Cession of California, Nevada, Utah, and much of present-day Colorado and the American Southwest . The California gold rush of 1848–1849 spurred a huge migration of white settlers to the Pacific coast, leading to even more confrontations with Native populations. One of
14868-754: Was adopted on July 4, 1776. The political values of the American Revolution included liberty , inalienable individual rights ; and the sovereignty of the people ; supporting republicanism and rejecting monarchy , aristocracy , and all hereditary political power; civic virtue ; and vilification of political corruption . The Founding Fathers of the United States , who included Washington, Jefferson, John Adams , Benjamin Franklin , Alexander Hamilton , John Jay , James Madison , Thomas Paine , and many others, were inspired by Greco-Roman , Renaissance , and Enlightenment philosophies and ideas. The Articles of Confederation were ratified in 1781 and established
14994-512: Was compounded by the subsequent admission of Oregon as a free state in 1859. The following table shows the balance between slave and free states that began in 1812. The Statehood columns provide the year the state either ratified the U.S. Constitution or was admitted to the Union . The date ranges in the Abolition column for Free States indicate when gradual abolition laws were adopted and when slavery finally ended, except for states where slavery
15120-548: Was considered by the slave states to be politically imperative that the number of free states not exceed the number of slave states, so new states were admitted in slave–free pairs. There were, nonetheless, some slaves in most free states up to the 1840 census, and the Fugitive Slave Clause of the U.S. Constitution , as implemented by the Fugitive Slave Act of 1793 and the Fugitive Slave Act of 1850 , provided that
15246-510: Was elected the country's first president under the Constitution, and the Bill of Rights was adopted in 1791 to allay skeptics' concerns about the power of the more centralized government. His resignation as commander-in-chief after the Revolutionary War and his later refusal to run for a third term as the country's first president established a precedent for the supremacy of civil authority in
15372-732: Was generally abolitionist: In a plan endorsed by Abraham Lincoln, slavery in the District of Columbia , which the Southern contingent had protected, was abolished in 1862. In Southern states, freedom for slaves typically followed the Union army's gaining control of an area. The Emancipation Proclamation declared all enslaved people in areas then under Confederate control free, but, in practice, freedom required either slaves reaching Union lines or Union forces reaching their area. As Union forces advanced from January 1, 1863, to June 19, 1865 , slaves were freed. West Virginia did not abolish slavery in its first proposed constitution of 1861, though it did ban
15498-563: Was initiated to organize Kansas for admission as a slave state, paired with Minnesota , but the admission of Kansas as a slave state was blocked because its proposed pro-slavery constitution (the Lecompton Constitution ) had not been approved in an honest election. Anti-slavery proponents during the " Bleeding Kansas " period of the later 1850s were called Free-Staters and Free-Soilers , and fought against pro-slavery Border Ruffians from Missouri. The animosity escalated throughout
15624-404: Was outlawed in a specific year. From 1812 through 1850, maintaining the balance of free and slave state votes in the Senate was considered of paramount importance if the Union were to be preserved, and states were typically admitted in pairs: California was admitted as a free state in 1850 without an accompanying slave state, though certain concessions were made to the slave states as part of
15750-561: Was still independent before it joined the United States as the 14th state in 1791. These state jurisdictions thus enacted the first abolition laws in the Atlantic World . By 1804 (including New York (1799) and New Jersey (1804)), all of the Northern states had abolished slavery or set measures in place to gradually abolish it, although there were still hundreds of ex-slaves working without pay as indentured servants in Northern states as late as
15876-424: Was the highest in the world, constituting over 25% of the global economy or 15% at purchasing power parity (PPP). From 1983 to 2008, U.S. real compounded annual GDP growth was 3.3%, compared to a 2.3% weighted average for the rest of the G7 . The country ranks first in the world by nominal GDP , second when adjusted for purchasing power parities (PPP), and ninth by PPP-adjusted GDP per capita . It possesses
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