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147-579: Iowa ( / ˈ aɪ . ə w ə / EYE -ə-wə ) is a state in the upper Midwestern region of the United States . It borders the Mississippi River to the east and the Missouri River and Big Sioux River to the west; Wisconsin to the northeast, Illinois to the east and southeast, Missouri to the south, Nebraska to the west, South Dakota to the northwest, and Minnesota to
294-627: A U.S. Army by Native Americans. The British demanded the establishment of a Native American barrier state at the Treaty of Ghent which ended the War of 1812 , but American negotiators rejected the idea because Britain had lost control of the region in the Battle of Lake Erie and the Battle of the Thames in 1813, where Tecumseh was killed by U.S. forces. The British then abandoned their Native American allies south of
441-585: A change from low-amplitude glacial cycles with a dominant periodicity of 41,000 years to asymmetric high-amplitude cycles dominated by a periodicity of 100,000 years. However, a 2020 study concluded that ice age terminations might have been influenced by obliquity since the Mid-Pleistocene Transition, which caused stronger summers in the Northern Hemisphere . Glaciation in the Pleistocene
588-459: A decline in air quality. Other factors negatively affecting Iowa's environment include the extensive use of older coal-fired power plants , fertilizer and pesticide runoff from crop production, and diminishment of the Jordan Aquifer . The 2020–2023 North American drought has affected Iowa particularly: As of January 2024, Iowa was in its 187th consecutive week of at least moderate drought ,
735-574: A deviation from today's annual mean temperature, taken as zero. This sort of graph is based on another isotope ratio versus time. Ratios are converted to a percentage difference from the ratio found in standard mean ocean water (SMOW). The graph in either form appears as a waveform with overtones . One half of a period is a Marine isotopic stage (MIS). It indicates a glacial (below zero) or an interglacial (above zero). Overtones are stadials or interstadials. According to this evidence, Earth experienced 102 MIS stages beginning at about 2.588 Ma BP in
882-421: A few regions had been studied and the names were relatively few. Today the geologists of different nations are taking more of an interest in Pleistocene glaciology. As a consequence, the number of names is expanding rapidly and will continue to expand. Many of the advances and stadials remain unnamed. Also, the terrestrial evidence for some of them has been erased or obscured by larger ones, but evidence remains from
1029-455: A house, clearing the ground, and planting crops. A number of means facilitated the legal settlement of the territories in the Midwest: land speculation , federal public land auctions , bounty land grants in lieu of pay to military veterans, and, later, preemption rights for squatters. The "squatters" became "pioneers" and were increasingly able to purchase the lands on which they had settled for
1176-587: A line along 43 degrees, 30 minutes north latitude. The southern border is the Des Moines River and a not-quite-straight line along approximately 40 degrees 35 minutes north, as decided by the U.S. Supreme Court in Missouri v. Iowa (1849) after a standoff between Missouri and Iowa known as the Honey War . Iowa is the only state whose east and west borders are formed almost entirely by rivers. Carter Lake, Iowa ,
1323-534: A supernatural being who lived in the sky and was believed to have created the world and the Huron people. At death, Hurons thought the soul left the body to live in a village in the sky. Chippewas were a deeply religious people who believed in the Great Spirit. They worshiped the Great Spirit through all their seasonal activities, and viewed religion as a private matter: Each person's relation with his personal guardian spirit
1470-568: A team of Russian scientists in collaboration with Princeton University announced that they had brought two female nematodes frozen in permafrost , from around 42,000 years ago, back to life. The two nematodes, at the time, were the oldest confirmed living animals on the planet. The evolution of anatomically modern humans took place during the Pleistocene. At the beginning of the Pleistocene Paranthropus species were still present, as well as early human ancestors, but during
1617-538: A written form of language. In the 16th century, the natives of the area used projectiles and tools of stone, bone, and wood to hunt and farm. They made canoes for fishing. Most of them lived in oval or conical wigwams that could be easily moved away. Various tribes had different ways of living. The Ojibwas were primarily hunters and fishing was also important in the Ojibwas economy. Other tribes such as Sac, Fox, and Miami, both hunted and farmed. They were oriented toward
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#17328377395971764-883: Is Heartland . Among the Native Americans , Paleo-Americans cultures were the earliest in North America, with a presence in the Great Plains and Great Lakes areas from about 12,000 BCE to around 8,000 BCE. Following the Paleo-American period is the Archaic period (8,000 BCE to 1,000 BCE), the Woodland Tradition (1,000 BCE to 100 CE), and the Mississippian Period (900 to 1500 CE). Archeological evidence indicates that Mississippian culture traits probably began in
1911-616: Is categorized as the Central forest-grasslands transition ecoregion. The Northern, drier part of Iowa is categorized as part of the Central tall grasslands . There is a dearth of natural areas in Iowa; less than 1% of the tallgrass prairie that once covered most of Iowa remains intact; only about 5% of the state's prairie pothole wetlands remain, and most of the original forest has been lost. As of 2005 Iowa ranked 49th of U.S. states in public land holdings. Threatened or endangered animals in Iowa include
2058-765: Is estimated that, at maximum glacial extent, 30% of the Earth's surface was covered by ice. In addition, a zone of permafrost stretched southward from the edge of the glacial sheet, a few hundred kilometres in North America , and several hundred in Eurasia . The mean annual temperature at the edge of the ice was −6 °C (21 °F); at the edge of the permafrost, 0 °C (32 °F). Each glacial advance tied up huge volumes of water in continental ice sheets 1,500 to 3,000 metres (4,900–9,800 ft) thick, resulting in temporary sea-level drops of 100 metres (300 ft) or more over
2205-454: Is no systematic correspondence between pluvials to glacials, however. Moreover, regional pluvials do not correspond to each other globally. For example, some have used the term "Riss pluvial" in Egyptian contexts. Any coincidence is an accident of regional factors. Only a few of the names for pluvials in restricted regions have been stratigraphically defined. The sum of transient factors acting at
2352-518: Is part of the Driftless Area , consisting of steep hills and valleys which appear as mountainous. Several natural lakes exist, most notably Spirit Lake , West Okoboji Lake , and East Okoboji Lake in northwest Iowa ( see Iowa Great Lakes ). To the east lies Clear Lake . Man-made lakes include Lake Odessa, Saylorville Lake , Lake Red Rock , Coralville Lake , Lake MacBride, and Rathbun Lake. Before European settlement, 4 to 6 million acres of
2499-460: Is ranked among the best states and it performs highly on metrics such as governance, education, infrastructure, and safety. Like many other states , Iowa takes its name from its predecessor, Iowa Territory , whose name in turn is derived from the Iowa River , and ultimately from the ethnonym of the indigenous Ioway people . The Ioway are a Chiwere -speaking Siouan Nation , who were once part of
2646-505: Is the brain drain , in which educated young adults leave the state in search of better prospects in higher education or employment. During the 1990s, Iowa had the second highest exodus rate for single, educated young adults, second only to North Dakota. The United States Census Bureau determined the population of Iowa was 3,190,369 on April 1, 2020, a 4.73% increase since the 2010 United States census . Midwestern United States The Midwestern United States (also referred to as
2793-506: Is the area between the historical foreground of European invasion and occupation and the background of Indian defeat and retreat. White specifically designates "the lands bordering the rivers flowing into the northern Great Lakes and the lands south of the lakes to the Ohio" as the location of the middle ground. This includes the modern Midwestern states of Ohio, Indiana, Illinois, Wisconsin, and Michigan as well as parts of Canada. The middle ground
2940-572: Is the only city in the state located west of the Missouri River. Iowa has 99 counties , but 100 county seats because Lee County has two. The state capital, Des Moines , is in Polk County . Iowa's bedrock geology generally decreases in age from east to west. In northwest Iowa, Cretaceous bedrock can be 74 million years old; in eastern Iowa Cambrian bedrock dates to c. 500 million years ago. The oldest radiometrically dated bedrock in
3087-578: The Ice Age ) is the geological epoch that lasted from c. 2.58 million to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations . Before a change was finally confirmed in 2009 by the International Union of Geological Sciences , the cutoff of the Pleistocene and the preceding Pliocene was regarded as being 1.806 million years Before Present (BP). Publications from earlier years may use either definition of
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#17328377395973234-516: The 1900 census , though Iowa now has a predominantly urban population. The Iowa Economic Development Authority, created in 2011 has replaced the Iowa Department of Economic Development and its annual reports are a source of economic information. Iowa is bordered by the Mississippi River on the east along with the Missouri River and the Big Sioux River on the west. The northern boundary is
3381-741: The Algonquian language family. Some tribes—such as the Stockbridge-Munsee and the Brothertown —are also Algonkian-speaking tribes who relocated from the eastern seaboard to the Great Lakes region in the 19th century. The Oneida belong to the Iroquois language group and the Ho-Chunk of Wisconsin are one of the few Great Lakes tribes to speak a Siouan language. American Indians in this area did not develop
3528-638: The Alpine ice sheet on the Alps . Scattered domes stretched across Siberia and the Arctic shelf. The northern seas were ice-covered. South of the ice sheets large lakes accumulated because outlets were blocked and the cooler air slowed evaporation. When the Laurentide Ice Sheet retreated, north-central North America was completely covered by Lake Agassiz . Over a hundred basins, now dry or nearly so, were overflowing in
3675-522: The Arikara , Hidatsa , Iowa , Kaw (or Kansa) , Kitsai , Mandan , Missouria , Nez Perce , Omaha , Osage , Otoe , Pawnee , Ponca , Quapaw , Santee , Wichita , and Yankton . The nomadic tribes of the Great Plains survived on hunting ; some of their major hunts centered on deer and buffalo. Some tribes are described as part of the "Buffalo Culture" (sometimes called, for the American bison ). Although
3822-481: The Blackfoot , Arapaho , Assiniboine , Cheyenne , Comanche , Crow , Gros Ventre , Kiowa , Lakota , Lipan , Plains Apache (or Kiowa Apache), Plains Cree , Plains Ojibwe , Sarsi , Shoshone , Stoney , and Tonkawa . The second group of Plains Indians (sometimes referred to as Prairie Indians) were the semi-sedentary tribes who, in addition to hunting buffalo, lived in villages and raised crops. These included
3969-582: The French and Indian War , transferred ownership to their ally, Spain. Spain practiced very loose control over the Iowa region, granting trading licenses to French and British traders, who established trading posts along the Mississippi and Des Moines Rivers . Iowa was part of a territory known as La Louisiane or Louisiana , and European traders were interested in lead and furs obtained by Indigenous people. The Sauk and Meskwaki effectively controlled trade on
4116-977: The Great Plains region. Chicago is the most populous city in the American Midwest and the third-most populous in the United States. Chicago and its suburbs , colloquially known as Chicagoland , form the largest metropolitan area with 10 million people, making it the fourth-largest metropolitan area in North America , after Greater Mexico City , the New York metropolitan area , and Greater Los Angeles . Other large Midwestern cities include Columbus , Indianapolis , Detroit , Milwaukee , Kansas City , Omaha , Minneapolis , Wichita , Cleveland , Cincinnati , St. Paul , St. Louis , and Des Moines . Large midwestern metropolitan areas include Metro Detroit , Minneapolis–St. Paul , Greater St. Louis , Greater Cincinnati ,
4263-622: The Haitian Revolution and together with the fact that France could not effectively defend Louisiana from a possible British attack, he sold the territory to the United States in the Louisiana Purchase of 1803. Meanwhile, the British maintained forts and trading posts in U.S. territory, refusing to give them up until 1796 by the Jay Treaty . American settlement began either via routes over
4410-550: The Ho-Chunk Confederation that inhabited the area now corresponding to several Midwest states. The Ioway were one of the many Native American nations whose territory comprised the future state of Iowa before the time of European colonization. When Indigenous peoples of the Americas first arrived in what is now Iowa more than 13,000 years ago, they were hunters and gatherers living in a Pleistocene glacial landscape. By
4557-521: The ICS timescale, the Pleistocene is divided into four stages or ages , the Gelasian , Calabrian , Chibanian (previously the unofficial "Middle Pleistocene"), and Upper Pleistocene (unofficially the "Tarantian"). In addition to these international subdivisions, various regional subdivisions are often used. In 2009 the International Union of Geological Sciences (IUGS) confirmed a change in time period for
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4704-631: The Isthmus of Panama , causing a faunal interchange between the two regions and changing ocean circulation patterns, with the onset of glaciation in the Northern Hemisphere occurring around 2.7 million years ago. During the Early Pleistocene (2.58–0.8 Ma), archaic humans of the genus Homo originated in Africa and spread throughout Afro-Eurasia . The end of the Early Pleistocene is marked by
4851-538: The Kansas City metro area , the Columbus metro area , and Greater Cleveland . The region's economy is a mix of heavy industry and agriculture, with extensive areas forming part of the United States' Corn Belt . Finance and services such as medicine and education are becoming increasingly important. Its central location makes it a transportation crossroads for river boats, railroads, autos, trucks, and airplanes. Politically,
4998-576: The Late Archaic period , Native Americans in Iowa began utilizing domesticated plants. The subsequent Woodland period saw an increased reliance on agriculture and social complexity, with increased use of mounds, ceramics, and specialized subsistence. During the Late Prehistoric period (beginning about AD 900) increased use of maize and social changes led to social flourishing and nucleated settlements. The arrival of European trade goods and diseases in
5145-660: The Laurentide Ice Sheet . Charles Lyell introduced the term "Pleistocene" in 1839 to describe strata in Sicily that had at least 70% of their molluscan fauna still living today. This distinguished it from the older Pliocene Epoch , which Lyell had originally thought to be the youngest fossil rock layer. He constructed the name "Pleistocene" ('most new' or 'newest') from the Greek πλεῖστος ( pleīstos ) 'most' and καινός ( kainós ( Latinized as cænus ) 'new'). This contrasts with
5292-451: The Louisiana Purchase , and establish trade and U.S. sovereignty over the native peoples along the Missouri River . The Lewis and Clark Expedition established relations with more than two dozen indigenous nations west of the Missouri River. The Expedition returned east to St. Louis in the spring of 1806. The Midwest has been a key swing district in national elections, with highly contested elections in closely divided states often deciding
5439-706: The Meskwaki Settlement remains to this day. In 1856 the Iowa Legislature passed an unprecedented act allowing the Meskwaki to purchase the land. However, in contrast to the unprecedented act of the Iowa Legislature, the United States Federal Government, through the use of Treaties, forced the Ho-Chunk from Iowa in 1848, and forced the Dakota from Iowa by 1858. Western Iowa around modern Council Bluffs
5586-542: The Mid-Pleistocene Transition , with the cyclicity of glacial cycles changing from 41,000-year cycles to asymmetric 100,000-year cycles, making the climate variation more extreme. The Late Pleistocene witnessed the spread of modern humans outside of Africa as well as the extinction of all other human species. Humans also spread to the Australian continent and the Americas for the first time, co-incident with
5733-424: The Mississippi River , averages 52 °F (11 °C). Snowfall is common, with Des Moines getting about 26 days of snowfall a year, and other places, such as Shenandoah getting about 11 days of snowfall in a year. Spring ushers in the beginning of the severe weather season. As of 2008, Iowa averaged about 50 days of thunderstorm activity per year. As of 2015, the 30-year annual average of tornadoes in Iowa
5880-635: The Ruwenzori Range in east and central Africa were larger. Glaciers existed in the mountains of Ethiopia and to the west in the Atlas Mountains . In the northern hemisphere, many glaciers fused into one. The Cordilleran Ice Sheet covered the North American northwest; the east was covered by the Laurentide . The Fenno-Scandian ice sheet rested on northern Europe , including much of Great Britain;
6027-721: The Saint Lawrence River by Jacques Cartier in 1534 and ending with their cessation of the majority of their holdings in North America to the Kingdom of Great Britain in the Treaty of Paris (1763) . In 1673 the Governor of New France sent Jacques Marquette , a Catholic priest and missionary, and Louis Jolliet , a fur trader , to map the way to the Northwest Passage to the Pacific. They traveled through Michigan's upper peninsula to
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6174-752: The St. Louis, Missouri area and spread northwest along the Mississippi and Illinois rivers and entered the state along the Kankakee River system. It also spread northward into Indiana along the Wabash , Tippecanoe , and White Rivers. Mississippian peoples in the Midwest were mostly farmers who followed the rich, flat floodplains of Midwestern rivers. They brought with them a well-developed agricultural complex based on three major crops— maize , beans , and squash . Maize, or corn,
6321-406: The Treaty of Paris , Spain was given Louisiana ; the area west of the Mississippi. St. Louis and Ste. Genevieve in Missouri were the main towns, but there was little new settlement. France regained Louisiana from Spain in exchange for Tuscany by the terms of the Treaty of San Ildefonso in 1800. Napoleon had lost interest in re-establishing a French colonial empire in North America following
6468-435: The U.S. Congress established the Territory of Iowa . President Martin Van Buren appointed Robert Lucas governor of the territory, which at the time had 22 counties and a population of 23,242. Almost immediately after achieving territorial status, a clamor arose for statehood. On December 28, 1846, Iowa became the 29th state in the Union when President James K. Polk signed Iowa's admission bill into law. Once admitted to
6615-476: The interior least tern , piping plover , Indiana bat , pallid sturgeon , the Iowa Pleistocene land snail , Higgins' eye pearly mussel , and the Topeka shiner . Endangered or threatened plants include western prairie fringed orchid , eastern prairie fringed orchid , Mead's milkweed , prairie bush clover , and northern wild monkshood . The explosion in the number of high-density livestock facilities in Iowa has led to increased rural water contamination and
6762-477: The last glacial period ended about 10,000 years ago. Over 11 major glacial events have been identified, as well as many minor glacial events. A major glacial event is a general glacial excursion, termed a "glacial." Glacials are separated by "interglacials". During a glacial, the glacier experiences minor advances and retreats. The minor excursion is a "stadial"; times between stadials are "interstadials". These events are defined differently in different regions of
6909-484: The woolly rhinoceros , various giraffids , such as the Sivatherium ; ground sloths , Irish elk , cave lions , cave bears , Gomphotheres , American lions , dire wolves , and short-faced bears , began late in the Pleistocene and continued into the Holocene. Neanderthals also became extinct during this period. At the end of the last ice age, cold-blooded animals, smaller mammals like wood mice , migratory birds, and swifter animals like whitetail deer had replaced
7056-415: The 1832 Black Hawk War . The Sauk and Meskwaki were forced to sell some of their land in the Mississippi Valley to the U.S. in 1832 in the Black Hawk Purchase Treaty and sold their remaining land in Iowa in 1842, most of them moving to a reservation in Kansas. In 1837, some the Potawatomi from Illinois were resettled in Iowa, while many Meskwaki later returned to Iowa and settled near Tama, Iowa ;
7203-593: The Appalachian Mountains or through the waterways of the Great Lakes. Fort Pitt (now Pittsburgh ) at the source of the Ohio River became the main base for settlers moving into the Midwest. Marietta, Ohio in 1787 became the first settlement in Ohio, but not until the defeat of Native American tribes at the Battle of Fallen Timbers in 1794 was large-scale settlement possible. Large numbers also came north from Kentucky into southern Ohio, Indiana and Illinois. The region's fertile soil produced corn and vegetables; most farmers were self-sufficient. They cut trees and claimed
7350-404: The Army of the Potomac in Virginia and fought under Union General Philip Sheridan in the Shenandoah Valley . Many died and were buried at Andersonville. They marched on General Nathaniel Banks ' ill-starred expedition to the Red River. Twenty-seven Iowans have been awarded the Medal of Honor , the highest military decoration awarded by the United States government, which was first awarded in
7497-418: The British. Black Hawk took part in the siege of Fort Madison. Another small military outpost was established along the Mississippi River in present-day Bellevue . This poorly situated stockade was similarly attacked by hundreds of Indigenous people in 1813, but was successfully defended and later abandoned until settlers returned to the area in the mid-1830s. After the war, the U.S. re-established control of
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#17328377395977644-446: The Civil War. Iowa had several brigadier generals and four major generals— Grenville Mellen Dodge , Samuel R. Curtis , Francis J. Herron , and Frederick Steele —and saw many of its generals go on to state and national prominence following the war. Following the Civil War, Iowa's population continued to grow dramatically, from 674,913 people in 1860 to 1,624,615 in 1880. The American Civil War briefly brought higher profits. In 1917,
7791-414: The Depression. The crisis spurred a major, decade-long population decline. After bottoming out in the 1980s, Iowa's economy began to reduce its dependence on agriculture. By the early 21st century, it was characterized by a mix of manufacturing, biotechnology, finance and insurance services, and government services. The population of Iowa has increased at a slower rate than the U.S. as a whole since at least
7938-489: The Early Pleistocene Gelasian . Early Pleistocene stages were shallow and frequent. The latest were the most intense and most widely spaced. By convention, stages are numbered from the Holocene, which is MIS1. Glacials receive an even number and interglacials receive an odd number. The first major glacial was MIS2-4 at about 85–11 ka BP. The largest glacials were 2, 6, 12, and 16. The warmest interglacials were 1, 5, 9 and 11. For matching of MIS numbers to named stages, see under
8085-409: The Earth's surface is cyclical: climate, ocean currents and other movements, wind currents, temperature, etc. The waveform response comes from the underlying cyclical motions of the planet, which eventually drag all the transients into harmony with them. The repeated glaciations of the Pleistocene were caused by the same factors. The Mid-Pleistocene Transition , approximately one million years ago, saw
8232-452: The Endeavors of Government, or Fear of Indians has kept them properly within Bounds." The British had a long-standing goal of establishing a Native American buffer state in the American Midwest to resist American westward expansion. With victory in the American Revolution the new government considered evicting the squatters from areas that were now federally owned public lands. In 1785, soldiers under General Josiah Harmar were sent into
8379-411: The French and British, conflicts and treaties with the United States both during the Revolutionary War and after , and its ultimate clearing/erasure throughout the nineteenth century. European settlement of the area began in the 17th century following French exploration of the region and became known as New France , including the Illinois Country . The French period began with the exploration of
8526-431: The French and the British into competition with each other to their own benefit. The Indian demand for certain kinds of cloth in particular fueled this competition. This, however, changed following the Seven Years' War with Britain's victory over France and the cession of New France to Great Britain. The British attempted to establish a more assertive relationship with the Indians of the pays d'en haut , eliminating
8673-452: The Indochina War. An exception was required for this resettlement as State Dept policy at the time forbid resettlement of large groups of refugees in concentrated communities; an exception was ultimately granted and 1200 Tai Dam were resettled in Iowa. Since then Iowa has accepted thousands of refugees from Laos, Cambodia, Thailand, Bhutan, and Burma. The farm crisis of the 1980s caused a major recession in Iowa, causing poverty not seen since
8820-441: The Iowa portion of the Quad Cities . Iowa is home to 940 small towns, though its population is increasingly urbanized as small communities and rural areas decline in population. During the 18th and early 19th centuries, Iowa was a part of French Louisiana and Spanish Louisiana ; its state flag is patterned after the flag of France . After the Louisiana Purchase , pioneers laid the foundation for an agriculture-based economy in
8967-407: The Louisiana Purchase into two parts—the Territory of Orleans and the District of Louisiana, with present-day Iowa falling in the latter. The Indiana Territory , created in 1800, exercised jurisdiction over this portion of the District; William Henry Harrison was its first governor. Much of Iowa was mapped by Zebulon Pike in 1805, but it was not until the construction of Fort Madison in 1808 that
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#17328377395979114-417: The Midwest or the American Midwest ) is one of the four census regions defined by the United States Census Bureau . It occupies the northern central part of the United States . It was officially named the North Central Region by the U.S. Census Bureau until 1984. It is between the Northeastern United States and the Western United States , with Canada to the north and the Southern United States to
9261-407: The Mississippi in the late 18th century and early 19th century. Among the early traders on the Mississippi were Julien Dubuque , Robert de la Salle , and Paul Marin . Along the Missouri River at least five French and English trading houses were built before 1808. In 1800, Napoleon Bonaparte took control of Louisiana from Spain in a treaty . After the 1803 Louisiana Purchase , Congress divided
9408-479: The North American west. Lake Bonneville , for example, stood where Great Salt Lake now does. In Eurasia, large lakes developed as a result of the runoff from the glaciers. Rivers were larger, had a more copious flow, and were braided . African lakes were fuller, apparently from decreased evaporation. Deserts, on the other hand, were drier and more extensive. Rainfall was lower because of the decreases in oceanic and other evaporation. It has been estimated that during
9555-411: The Ohio country to destroy the crops and burn down the homes of any squatters they found living there. But overall the federal policy was to move Indians to western lands (such as the Indian Territory in modern Oklahoma) and allow a very large numbers of farmers to replace a small number of hunters. Congress repeatedly debated how to legalize settlements. On the one hand, Whigs such as Henry Clay wanted
9702-470: The Plains Indians hunted other animals, such as elk or antelope , bison was their primary game food source. Bison flesh, hide, and bones from bison hunting provided the chief source of raw materials for items that Plains Indians made, including food, cups, decorations, crafting tools, knives, and clothing. The tribes followed the bison's seasonal grazing and migration. The Plains Indians lived in teepees because they were easily disassembled and allowed
9849-434: The Pleistocene to 2.58 Ma, results in the inclusion of all the recent repeated glaciations within the Pleistocene. Radiocarbon dating is considered to be inaccurate beyond around 50,000 years ago. Marine isotope stages (MIS) derived from Oxygen isotopes are often used for giving approximate dates. Pleistocene non-marine sediments are found primarily in fluvial deposits , lakebeds, slope and loess deposits as well as in
9996-436: The Pleistocene's overall climate could be characterised as a continuous El Niño with trade winds in the south Pacific weakening or heading east, warm air rising near Peru , warm water spreading from the west Pacific and the Indian Ocean to the east Pacific, and other El Niño markers. Pleistocene climate was marked by repeated glacial cycles in which continental glaciers pushed to the 40th parallel in some places. It
10143-430: The Pleistocene, changing the start date from 1.806 to 2.588 million years BP, and accepted the base of the Gelasian as the base of the Pleistocene, namely the base of the Monte San Nicola GSSP . The start date has now been rounded down to 2.580 million years BP. The IUGS has yet to approve a type section , Global Boundary Stratotype Section and Point (GSSP), for the upper Pleistocene/Holocene boundary ( i.e.
10290-605: The Pleistocene, the East Antarctic Ice Sheet thinned by at least 500 meters, and that thinning since the Last Glacial Maximum is less than 50 meters and probably started after ca 14 ka. During the 2.5 million years of the Pleistocene, numerous cold phases called glacials ( Quaternary ice age ), or significant advances of continental ice sheets, in Europe and North America, occurred at intervals of approximately 40,000 to 100,000 years. The long glacial periods were separated by more temperate and shorter interglacials which lasted about 10,000–15,000 years. The last cold episode of
10437-411: The Pleistocene, the plates upon which they sit probably having moved no more than 100 km (62 mi) relative to each other since the beginning of the period. In glacial periods, the sea level would drop by up to 120 m (390 ft) lower than today during peak glaciation, exposing large areas of the present continental shelf as dry land. According to Mark Lynas (through collected data),
10584-476: The Protohistoric period led to dramatic population shifts and economic and social upheaval, with the arrival of new tribes and early European explorers and traders. There were numerous native American tribes living in Iowa at the time of early European exploration. Tribes which were probably descendants of the prehistoric Oneota include the Dakota , Ho-Chunk , Ioway , and Otoe . Tribes which arrived in Iowa in
10731-636: The U.S. established tenuous military control over the region. Fort Madison was built to control trade and establish U.S. dominance over the Upper Mississippi, but it was poorly designed and disliked by the Sauk and Meskwaki, many of whom allied with the British, who had not abandoned claims to the territory. Fort Madison was defeated by British-supported Indigenous people in 1813 during the War of 1812 , and Fort Shelby in Prairie du Chien, Wisconsin , also fell to
10878-450: The Union, the state's boundary issues resolved, and most of its land purchased from Natives, Iowa set its direction to development and organized campaigns for settlers and investors, boasting the young frontier state's rich farmlands, fine citizens, free and open society, and good government. Iowa has a long tradition of state and county fairs. The first and second Iowa State Fairs were held in
11025-453: The United States entered World War I and farmers as well as all Iowans experienced a wartime economy. For farmers, the change was significant. Since the beginning of the war in 1914, Iowa farmers had experienced economic prosperity, which lasted until the end of the war. In the economic sector, Iowa also has undergone considerable change. Beginning with the first industries developed in the 1830s, which were mainly for processing materials grown in
11172-767: The alliance it created. In the meshed French and Algonquian system of trade, the Algonquian familial metaphor of a father and his children shaped the political relationship between the French and the Natives in this region. The French, regarded as the metaphoric father, were expected to provide for the needs of the Algonquians and, in return, the Algonquians, the metaphoric children, would be obligated to assist and obey them. Traders coming into Indian villages facilitated this system of symbolic exchange to establish or maintain alliances and friendships. Marriage also became an important aspect of
11319-687: The appearance of Homo sapiens about 300,000 years ago. Artifacts associated with modern human behavior are unambiguously attested starting 40,000–50,000 years ago. According to mitochondrial timing techniques, modern humans migrated from Africa after the Riss glaciation in the Middle Palaeolithic during the Eemian Stage , spreading all over the ice-free world during the late Pleistocene. A 2005 study posits that humans in this migration interbred with archaic human forms already outside of Africa by
11466-548: The area, Iowa has experienced a gradual increase in the number of business and manufacturing operations. The transition from an agricultural economy to a mixed economy happened slowly. The Great Depression and World War II accelerated the shift away from smallholder farming to larger farms, and began a trend of urbanization. The period after World War II witnessed a particular increase in manufacturing operations. In 1975, Governor Robert D. Ray petitioned President Ford to allow Iowa to accept and resettle Tai Dam refugees fleeing
11613-686: The armed forces, over one-sixth of whom were killed before the Confederates surrendered at Appomattox . Most fought in the great campaigns in the Mississippi Valley and in the South . Iowa troops fought at Wilson's Creek in Missouri , Pea Ridge in Arkansas , Forts Henry and Donelson, Shiloh, Chattanooga, Chickamauga, Missionary Ridge, and Rossville Gap as well as Vicksburg, Iuka, and Corinth. They served with
11760-465: The articles for those names. Both marine and continental faunas were essentially modern but with many more large land mammals such as Mammoths , Mastodons , Diprotodons , Smilodons , tigers , lions , Aurochs , short-faced bears , giant sloths , species within Gigantopithecus and others. Isolated landmasses such as Australia , Madagascar , New Zealand and islands in the Pacific saw
11907-525: The conflict, the British government was forced to compromise and loosely re-created a trade system that was an echo of the French one. While French control ended in 1763 after their defeat in the Seven Years' War, most of the several hundred French settlers in small villages along the Mississippi River and its tributaries remained, and were not disturbed by the new British administration. By the terms of
12054-606: The entire surface of the Earth. During interglacial times, such as at present, drowned coastlines were common, mitigated by isostatic or other emergent motion of some regions. The effects of glaciation were global. Antarctica was ice-bound throughout the Pleistocene as well as the preceding Pliocene. The Andes were covered in the south by the Patagonian ice cap. There were glaciers in New Zealand and Tasmania . The current decaying glaciers of Mount Kenya , Mount Kilimanjaro , and
12201-772: The evolution of large birds and even reptiles such as the Elephant bird , moa , Haast's eagle , Quinkana , Megalania and Meiolania . The severe climatic changes during the Ice Age had major impacts on the fauna and flora. With each advance of the ice, large areas of the continents became depopulated, and plants and animals retreating southwards in front of the advancing glacier faced tremendous stress. The most severe stress resulted from drastic climatic changes, reduced living space, and curtailed food supply. A major extinction event of large mammals ( megafauna ), which included mammoths , mastodons , saber-toothed cats , glyptodons ,
12348-435: The expense of more rural counties. Iowa, in common with other Midwestern states (especially Kansas , Nebraska , North Dakota , and South Dakota ), is feeling the brunt of rural flight , although Iowa has been gaining population since approximately 1990. Some smaller communities, such as Denison and Storm Lake , have mitigated this population loss through gains in immigrant laborers. Another demographic problem for Iowa
12495-444: The extinction of most large-bodied animals in these regions. The aridification and cooling trends of the preceding Neogene were continued in the Pleistocene. The climate was strongly variable depending on the glacial cycle, with the sea levels being up to 120 metres (390 ft) lower than present at peak glaciation, allowing the connection of Asia and North America via Beringia and the covering of most of northern North America by
12642-523: The fairgrounds were being used as an army supply depot; and in 2020 due to the COVID-19 pandemic in the United States . Iowa supported the Union during the Civil War , voting heavily for Abraham Lincoln , though there was an antiwar " Copperhead " movement in the state, caused partially by a drop in crop prices caused by the war. There were no battles in the state, although the Battle of Athens , Missouri, 1861,
12789-501: The female line, while the others favored the patrilineal method. All tribes were governed under chiefdoms or complex chiefdoms. For example, Hurons were divided into matrilineal clans, each represented by a chief in the town council, where they met with a town chief on civic matters. But Chippewa people's social and political life was simpler than that of settled tribes. The religious beliefs varied among tribes. Hurons believed in Yoscaha ,
12936-414: The glacial range, which have their own glacial history depending on latitude, terrain and climate. There is a general correspondence between glacials in different regions. Investigators often interchange the names if the glacial geology of a region is in the process of being defined. However, it is generally incorrect to apply the name of a glacial in one region to another. For most of the 20th century, only
13083-567: The global climate change of the Little Ice Age . Their culture effectively ended before 1492. The major tribes of the Great Lakes region included the Huron , Ottawa , Ojibwe , Potawatomi , Ho-Chunk , Menominee , Sauk , Meskwaki , Neutrals , and the Miami . Most numerous were the Huron and Ho-Chunk. Fighting and battle were often launched between tribes, with the losers forced to flee. Most are of
13230-613: The government to get maximum revenue and also wanted stable middle-class law-abiding settlements of the sort that supported towns (and bankers). Jacksonian Democrats such as Thomas Hart Benton wanted the support of poor farmers, who reproduced rapidly, had little cash, and were eager to acquire cheap land in the West. Democrats did not want a big government, and keeping revenues low helped that cause. Democrats avoided words like "squatter" and regarded "actual settlers" as those who gained title to land, settled on it, and then improved upon it by building
13377-511: The growing influence of women in the fur trade also came the increasing demand of cloth which very quickly grew to be the most desired trade good. English traders entered the Ohio country as a serious competitor to the French in the fur trade around the 1690s. English (and later British) traders almost consistently offered the Indians better goods and better rates than the French, with the Indians being able to play that to their advantage, thrusting
13524-699: The heart of the Corn Belt . In the latter half of the 20th century, Iowa's agricultural economy began to transition to a diversified economy of advanced manufacturing, processing, financial services , information technology , biotechnology , and green energy production. Politically, Iowa is notable for the Iowa Caucuses , an influential event in national politics, as well as its high levels of voter turnout and foundational leadership in civil rights including early adoption or support of black suffrage , women's rights , and same-sex marriage . Iowa's standard of living
13671-450: The historical terminology was established. Corresponding to the terms glacial and interglacial, the terms pluvial and interpluvial are in use (Latin: pluvia , rain). A pluvial is a warmer period of increased rainfall; an interpluvial is of decreased rainfall. Formerly a pluvial was thought to correspond to a glacial in regions not iced, and in some cases it does. Rainfall is cyclical also. Pluvials and interpluvials are widespread. There
13818-445: The immediately preceding Pliocene ("newer", from πλείων ( pleíōn , "more") and kainós ) and the immediately subsequent Holocene ("wholly new" or "entirely new", from ὅλος ( hólos , "whole") and kainós ) epoch , which extends to the present time. The Pleistocene has been dated from 2.580 million (±0.005) to 11,700 years BP with the end date expressed in radiocarbon years as 10,000 carbon-14 years BP. It covers most of
13965-509: The lakes. The Native Americans ended being the main losers in the War of 1812 . Apart from the short Black Hawk War of 1832, the days of Native American warfare east of the Mississippi River had ended. In 1803, President Thomas Jefferson commissioned the Lewis and Clark Expedition that took place between May 1804 and September 1806. Launching from Camp Dubois in Illinois, the goal was to explore
14112-694: The land, then sold it to newcomers and then moved further west to repeat the process. Settlers without legal claims, called "squatters", had been moving into the Midwest for years before 1776. They pushed further and further down the Ohio River during the 1760s and 1770s and sometimes engaged in conflict with the Native Americans. British officials were outraged. These squatters were characterized by British General Thomas Gage as "too Numerous, too Lawless, and Licentious ever to be restrained", and regarded them as "almost out of Reach of Law and government; Neither
14259-613: The large amounts of material moved about by glaciers. Less common are cave deposits, travertines and volcanic deposits (lavas, ashes). Pleistocene marine deposits are found primarily in shallow marine basins mostly (but with important exceptions) in areas within a few tens of kilometres of the modern shoreline. In a few geologically active areas such as the Southern California coast, Pleistocene marine deposits may be found at elevations of several hundred metres. The modern continents were essentially at their present positions during
14406-485: The late prehistoric or protohistoric periods include the Illiniwek , Meskwaki , Omaha , and Sauk . The first known European explorers to document Iowa were Jacques Marquette and Louis Jolliet who traveled the Mississippi River in 1673 documenting several Indigenous villages on the Iowa side. The area of Iowa was claimed for France and remained a French territory until 1763. The French, before their impending defeat in
14553-577: The latest period of repeated glaciation , up to and including the Younger Dryas cold spell. The end of the Younger Dryas has been dated to about 9700 BCE (11,700 calendar years BP). The end of the Younger Dryas is the official start of the current Holocene Epoch . Although it is considered an epoch, the Holocene is not significantly different from previous interglacial intervals within the Pleistocene. In
14700-453: The location of Native American settlements near the headwaters of the Wabash River , but on November 4 they were routed in battle by a tribal confederation led by Miami Chief Little Turtle and Shawnee chief Blue Jacket . More than 600 soldiers and scores of women and children were killed in the battle, which has since borne the name " St. Clair's Defeat ". It remains the greatest defeat of
14847-402: The longest stretch since the 1950s. 96% of areas are affected by drought. Iowa has a humid continental climate throughout the state ( Köppen climate classification Dfa ) with extremes of both heat and cold. The average annual temperature at Des Moines is 50 °F (10 °C); for some locations in the north, such as Mason City, the figure is about 45 °F (7 °C), while Keokuk , on
14994-466: The lower Palaeolithic they disappeared, and the only hominin species found in fossilic records is Homo erectus for much of the Pleistocene. Acheulean lithics appear along with Homo erectus , some 1.8 million years ago, replacing the more primitive Oldowan industry used by A. garhi and by the earliest species of Homo . The Middle Paleolithic saw more varied speciation within Homo , including
15141-478: The megafauna and migrated north. Late Pleistocene bighorn sheep were more slender and had longer legs than their descendants today. Scientists believe that the change in predator fauna after the late Pleistocene extinctions resulted in a change of body shape as the species adapted for increased power rather than speed. The extinctions hardly affected Africa but were especially severe in North America where native horses and camels were wiped out. In July 2018,
15288-554: The middle ground was introduced in Richard White's seminal work: The Middle Ground: Indians, Empires, and Republics in the Great Lakes Region, 1650–1815 originally published in 1991. White defines the middle ground like so: The middle ground is the place in between cultures, peoples, and in between empires and the non state world of villages. It is a place where many of the North American subjects and allies of empires lived. It
15435-558: The minimum price thanks to various preemption acts and laws passed throughout the 1810s-1840s. In Washington, Jacksonian Democrats favored squatter rights while banker-oriented Whigs were opposed; the Democrats prevailed. In 1791, General Arthur St. Clair became commander of the United States Army and led a punitive expedition with two Regular Army regiments and some militia. Near modern-day Fort Recovery , his force advanced to
15582-643: The more developed eastern part of the state at Fairfield . The first fair was held October 25–27, 1854, at a cost of around $ 323. Thereafter, the fair moved to locations closer to the center of the state and in 1886 found a permanent home in Des Moines. The State Fair has been held annually since then, except for a few exceptions: 1898 due to the Spanish–American War and the World's Fair being held in nearby Omaha, Nebraska ; from 1942 to 1945, due to World War II , as
15729-669: The most powerful and dominant tribes were the Dakota or Sioux , who occupied large amounts of territory in the Great Plains of the Midwest. The area of the Great Sioux Nation spread throughout the South and Midwest, up into the areas of Minnesota and stretching out west into the Rocky Mountains. At the same time, they occupied the heart of prime buffalo range, and also an excellent region for furs they could sell to French and American traders for goods such as guns. The Sioux (Dakota) became
15876-642: The most powerful of the Plains tribes and the greatest threat to American expansion. The Sioux comprise three major divisions based on Siouan dialect and subculture: Today, the Sioux maintain many separate tribal governments scattered across several reservations, communities, and reserves in the Dakotas, Nebraska, Minnesota, and Montana in the United States, as well as Manitoba and southern Saskatchewan in Canada. The theory of
16023-533: The national result. From 1860 to 1920, both parties tried to find their presidential and vice presidential candidates from the region. One of the two major political parties in the United States, the Republican Party , originated in the Midwest in the 1850s; Ripon, Wisconsin , had the first local meeting while Jackson, Michigan , had the first statewide meeting of the new party. Its membership included many Yankees out of New England and New York who had settled
16170-410: The native peoples who lived along the route were generally friendly, and that the natural resources of the lands in between were extraordinary. New France officials led by LaSalle followed up and erected a 4,000-mile (6,400 km) network of fur trading posts. The fur trade was an integral part of early European and Indian relations. It was the foundation upon which their interactions were built and
16317-491: The nomadic life of following game. When Spanish horses were obtained, the Plains tribes rapidly integrated them into their daily lives. By the early 18th century, many tribes had fully adopted a horse culture . Before their adoption of guns, the Plains Indians hunted with spears , bows , and bows and arrows , and various forms of clubs . The use of horses by the Plains Indians made hunting (and warfare) much easier. Among
16464-518: The north. Iowa is the 26th largest in total area and the 31st most populous of the 50 U.S. states , with a population of 3.19 million. The state's capital , most populous city , and largest metropolitan area fully located within the state is Des Moines . A portion of the larger Omaha, Nebraska, metropolitan area extends into three counties of southwest Iowa. Other metropolitan statistical areas in Iowa include Iowa City , Cedar Rapids , Waterloo-Cedar Falls , Ames , Dubuque , Sioux City , and
16611-506: The northern tip of Lake Michigan. On canoes, they crossed the massive lake and landed at present-day Green Bay, Wisconsin . They entered the Mississippi River on 17 June 1673. Marquette and Jolliet were the first to map the northern portion of the Mississippi River. They confirmed that it was easy to travel from the St. Lawrence River through the Great Lakes all the way to the Gulf of Mexico by water, that
16758-401: The northwest of the state receiving less than 28 inches (71 cm). The pattern of precipitation across Iowa is seasonal with more rain falling in the summer months. Virtually statewide, the driest month is January or February, and the wettest month is June owing to frequent showers and thunderstorms some of which produce hail, damaging winds or tornadoes. In Des Moines, roughly in the center of
16905-656: The open prairies where they engaged in communal hunts for buffalo (bison) . In the northern forests, the Ottawas and Potawatomis separated into small family groups for hunting. The Winnebagos and Menominees used both hunting methods interchangeably and built up widespread trade networks extending as far west as the Rockies, north to the Great Lakes, south to the Gulf of Mexico , and east to the Atlantic Ocean. The Hurons reckoned descent through
17052-472: The period. The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic age used in archaeology . The name is a combination of Ancient Greek πλεῖστος ( pleîstos ) 'most' and καινός ( kainós ; Latinized as cænus ) 'new'. At the end of the preceding Pliocene, the previously isolated North and South American continents were joined by
17199-572: The plains and rolling hills of the Great Plains of North America. Their colorful equestrian culture and famous conflicts with settlers and the US Army have made the Plains Indians archetypical in literature and art for American Indians everywhere. Plains Indians are usually divided into two broad classifications, with some degree of overlap. The first group were fully nomadic, following the vast herds of buffalo . Some tribes occasionally engaged in agriculture, growing tobacco and corn primarily. These included
17346-550: The practise of gift giving which they now saw as unnecessary. This, in combination with an underwhelming trade relationship with a surplus of whiskey, increase in prices generally, and a shortage of other goods led to unrest among the Indians that was exacerbated by the decision to significantly reduce the amount of rum being traded, a product that British merchants had been including in the trade for years. This would eventually culminate in Pontiac's War , which broke out in 1763. Following
17493-448: The processing of the pelts necessary to the fur trade. Women were integral to the fur trade and their contributions were lauded, so much so that the absence of the involvement of an Indian Woman was once cited as the cause for a trader's failure. When the French fur trade re-opened in 1716 upon the discovery that their overstock of pelts had been ruined, legal French traders continued to marry Indian women and remain in their villages. With
17640-417: The ratio of O to O (two isotopes of oxygen ) by mass (measured by a mass spectrometer ) present in the calcite of oceanic core samples is used as a diagnostic of ancient ocean temperature change and therefore of climate change. Cold oceans are richer in O , which is included in the tests of the microorganisms ( foraminifera ) contributing the calcite. A more recent version of
17787-455: The recent period of repeated glaciations. The name Plio-Pleistocene has, in the past, been used to mean the last ice age. Formerly, the boundary between the two epochs was drawn at the time when the foraminiferal species Hyalinea baltica first appeared in the marine section at La Castella, Calabria, Italy. However, the revised definition of the Quaternary , by pushing back the start date of
17934-531: The region (as it was in other regions), with Wisconsin a major center. Under the La Follettes , Wisconsin fought against the Republican bosses and for efficiency, modernization, and the use of experts to solve social, economic, and political problems. Pleistocene The Pleistocene ( / ˈ p l aɪ s t ə ˌ s iː n , - s t oʊ -/ PLY -stə-seen, -stoh- ; referred to colloquially as
18081-759: The region include, from east to west, the Ohio River , the Upper Mississippi River , and the Missouri River . The 2020 United States census put the population of the Midwest at 68,995,685. The Midwest is divided by the U.S. Census Bureau into two divisions. The East North Central Division includes Illinois, Indiana, Michigan, Ohio, and Wisconsin, all of which are also part of the Great Lakes region . The West North Central Division includes Iowa, Kansas, Minnesota, Missouri, North Dakota, Nebraska, and South Dakota, several of which are located, at least partly, within
18228-559: The region is composed of swing states , and therefore is heavily contested and often decisive in elections. The term West was applied to the region in British America and in the early years of the United States, when the colonial territories had not extended far from the Atlantic coast and the Pacific seaboard was generally unknown. By the early 19th century, anything west of Appalachia
18375-592: The region through the construction of Fort Armstrong , Fort Snelling in Minnesota , and Fort Atkinson in Nebraska . The United States encouraged settlement of the east side of the Mississippi and removal of Indians to the west. A disputed 1804 treaty between Quashquame and William Henry Harrison (then governor of the Indiana Territory ) that surrendered much of Illinois to the U.S. enraged many Sauk and led to
18522-407: The sampling process makes use of modern glacial ice cores. Although less rich in O than seawater, the snow that fell on the glacier year by year nevertheless contained O and O in a ratio that depended on the mean annual temperature. Temperature and climate change are cyclical when plotted on a graph of temperature versus time. Temperature coordinates are given in the form of
18669-632: The sole factor responsible for the variations in climate since they explain neither the long-term cooling trend over the Plio-Pleistocene nor the millennial variations in the Greenland Ice Cores known as Dansgaard-Oeschger events and Heinrich events. Milankovitch pacing seems to best explain glaciation events with periodicity of 100,000, 40,000, and 20,000 years. Such a pattern seems to fit the information on climate change found in oxygen isotope cores. In oxygen isotope ratio analysis, variations in
18816-558: The south. The U.S. Census Bureau's definition consists of 12 states in the north central United States: Illinois , Indiana , Iowa , Kansas , Michigan , Minnesota , Missouri , Nebraska , North Dakota , Ohio , South Dakota , and Wisconsin . The region generally lies on the broad Interior Plain between the states occupying the Appalachian Mountain range and the states occupying the Rocky Mountain range . Major rivers in
18963-467: The state is the 2.9 billion year old Otter Creek Layered Mafic Complex. Precambrian rock is exposed only in the northwest of the state. Iowa can be divided into eight landforms based on glaciation , soils , topography , and river drainage. Loess hills lie along the western border of the state, some of which are several hundred feet thick. Northeast Iowa along the Upper Mississippi River
19110-529: The state was covered with wetlands, about 95% of these wetlands have been drained. Iowa's natural vegetation is tallgrass prairie and savanna in upland areas, with dense forest and wetlands in flood plains and protected river valleys, and pothole wetlands in northern prairie areas. Most of Iowa is used for agriculture; crops cover 60% of the state, grasslands (mostly pasture and hay with some prairie and wetland) cover 30%, and forests cover 7%; urban areas and water cover another 1% each. The southern part of Iowa
19257-627: The state, over two-thirds of the 34.72 inches (88.2 cm) of rain falls from April through September, and about half the average annual precipitation falls from May through August peaking in June. Iowa's population is more urban than rural, with 61 percent living in urban areas in 2000, a trend that began in the early 20th century. Urban counties in Iowa grew 8.5% from 2000 to 2008, while rural counties declined by 4.2%. The shift from rural to urban has caused population increases in more urbanized counties such as Dallas , Johnson , Linn , Polk , and Scott , at
19404-421: The study of cyclical climate changes. The glacials in the following tables show historical usages, are a simplification of a much more complex cycle of variation in climate and terrain, and are generally no longer used. These names have been abandoned in favour of numeric data because many of the correlations were found to be either inexact or incorrect and more than four major glacials have been recognised since
19551-406: The time European explorers and traders visited Iowa, Native Americans were largely settled farmers with complex economic, social, and political systems. This transformation happened gradually. During the Archaic period (10,500 to 2,800 years ago), Native Americans adapted to local environments and ecosystems, slowly becoming more sedentary as populations increased. More than 3,000 years ago, during
19698-481: The trade in both the Ohio River valley and the French pays d'en haut with the temporary closing of the French fur trade from 1690 to 1716 and beyond. French fur traders were forced to abandon most posts and those remaining in the region became illegal traders who potentially sought these marriages to secure their safety. Another benefit for French traders marrying Indian women was that the Indian women were in charge of
19845-468: The upper Midwest. The party opposed the expansion of slavery and stressed the Protestant ideals of thrift, a hard work ethic, self-reliance, democratic decision making, and religious tolerance. In the early 1890s, the wheat-growing regions were strongholds of the short-lived Populist movement in the Plains states. Starting in the 1890s, the middle class urban Progressive movement became influential in
19992-622: The upper boundary). The proposed section is the North Greenland Ice Core Project ice core 75° 06' N 42° 18' W. The lower boundary of the Pleistocene Series is formally defined magnetostratigraphically as the base of the Matuyama (C2r) chronozone , isotopic stage 103. Above this point there are notable extinctions of the calcareous nannofossils : Discoaster pentaradiatus and Discoaster surculus . The Pleistocene covers
20139-556: Was 47. In 2008 , twelve people were killed by tornadoes in Iowa, making it the deadliest year since 1968 and also the second most tornadoes in a year with 105, matching the total from 2001. Iowa summers are known for heat and humidity, with daytime temperatures sometimes near 90 °F (32 °C) and occasionally exceeding 100 °F (38 °C). Average winters in the state have been known to drop well below freezing, even dropping below −18 °F (−28 °C). As of 2018, Iowa's all-time hottest temperature of 118 °F (48 °C)
20286-543: Was a series of glacials and interglacials, stadials and interstadials, mirroring periodic climate changes. The main factor at work in climate cycling is now believed to be Milankovitch cycles . These are periodic variations in regional and planetary solar radiation reaching the Earth caused by several repeating changes in the Earth's motion. The effects of Milankovitch cycles were enhanced by various positive feedbacks related to increases in atmospheric carbon dioxide concentrations and Earth's albedo. Milankovitch cycles cannot be
20433-424: Was a system that would evolve over time. Goods often traded included guns, clothing, blankets, strouds, cloth, tobacco, silver, and alcohol. The French and Indian exchange of goods was called an exchange of gifts rather than a trade. These gifts held greater meaning to the relationship between the two than a simple economic exchange because the trade itself was inseparable from the social relations it fostered and
20580-400: Was bounded by the Great Lakes and the Ohio and Mississippi Rivers. Some entities in the Midwest have "Northwest" in their names for historical reasons, such as Northwestern University in Illinois. One of the earliest late-19th-century uses of Midwest was in reference to Kansas and Nebraska to indicate that they were the civilized areas of the west. Another term applied to the same region
20727-639: Was considered American frontier . Over time the American frontier moved to west of the Mississippi River . During the colonial period, the upper-Mississippi watershed including the valleys of the Missouri River and the Illinois River , which were settled in the 17th and 18th century and called Illinois Country . In 1787 the Northwest Ordinance was enacted, creating the Northwest Territory , which
20874-483: Was formed on the foundations of mutual accommodation and common meanings established between the French and the Indians that then transformed and degraded as both were steadily lost as the French ceded their influence in the region in the aftermath of their defeat in the Seven Years' War and the Louisiana Purchase . Major aspects of the middle ground include blended culture, the fur trade , Native alliances with both
21021-589: Was fought just across the Des Moines River from Croton, Iowa , and shots from the battle landed in Iowa. Iowa sent large supplies of food to the armies and the eastern cities. Much of Iowa's support for the Union can be attributed to Samuel J. Kirkwood , its first wartime governor. Of a total population of 675,000, about 116,000 men were subjected to military duty. Iowa contributed proportionately more soldiers to Civil War military service than did any other state, north or south, sending more than 75,000 volunteers to
21168-514: Was part of his thinking every day of life. Ottawa and Potawatomi people had very similar religious beliefs to those of the Chippewas. In the Ohio River Valley, the dominant food supply was not hunting but agriculture. There were orchards and fields of crops that were maintained by indigenous women. Corn was their most important crop. The Plains Indians are the indigenous peoples who live on
21315-407: Was recorded at Keokuk on July 20, 1934, during a nationwide heat wave; as of 2014, the all-time lowest temperature of −47 °F (−44 °C) was recorded in Washta on January 12, 1912. Iowa has had a relatively smooth gradient of varying precipitation across the state; from 1961 to 1990, areas in the southeast of the state received an average of over 38 inches (97 cm) of rain annually, and
21462-413: Was the primary crop of Mississippian farmers. They gathered a wide variety of seeds, nuts, and berries, and fished and hunted for fowl to supplement their diets. With such an intensive form of agriculture , this culture supported large populations. The Mississippi period was characterized by a mound-building culture. The Mississippians suffered a tremendous population decline about 1400, coinciding with
21609-463: Was used as an Indian Reservation for members of the Council of Three Fires . The first American settlers officially moved to Iowa in June 1833. Primarily, they were families from Ohio , Pennsylvania , New York , Indiana , Kentucky , and Virginia who settled along the western banks of the Mississippi River , founding the modern day cities of Dubuque and Bellevue near the site of Julien Dubuque's 1785–1810 lead mining operation. On July 4, 1838,
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