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Illinois (/ˌɪlɪˈnɔɪ/ IL-in-OY) is a state in the Midwestern region of the United States. It borders Lake Michigan to its northeast, the Mississippi River to its west, and the Wabash and Ohio rivers to its south. Of the fifty U.S. states, Illinois has the fifth-largest gross domestic product (GDP), the sixth-largest population, and the 25th-most land area. Its capital city is Springfield in the center of the state, and the state's largest city is Chicago in the northeast.

Present-day Illinois was inhabited by Indigenous cultures for thousands of years. The French were the first Europeans to arrive, settling near the Mississippi and Illinois River in the 17th century Illinois Country, as part of their sprawling colony of New France. A century later, the revolutionary Illinois campaign prefigured American involvement in the region. Following U.S. independence in 1783, which made the Mississippi River the national boundary, American settlers began arriving from Kentucky via the Ohio River. Illinois was soon part of the United States' oldest territory, the Northwest Territory, and in 1818 it achieved statehood. The Erie Canal brought increased commercial activity in the Great Lakes, and the invention of the self-scouring steel plow by Illinoisan John Deere turned the state's rich prairie into some of the world's most productive and valuable farmland, attracting immigrant farmers from Germany and Sweden. In the mid-19th century, the Illinois and Michigan Canal and a sprawling railroad network facilitated trade, commerce, and settlement, making the state a transportation hub for the nation. By 1900, the growth of industrial jobs in the northern cities and coal mining in the central and southern areas attracted immigrants from Eastern and Southern Europe. Illinois became one of America's most industrialized states and remains a major manufacturing center. The Great Migration from the South established a large Black community, particularly in Chicago, which became a leading cultural, economic, and population center; its metropolitan area, informally referred to as Chicagoland, holds about 65% of the state's 12.8 million residents.

Two World Heritage Sites are in Illinois, the ancient Cahokia Mounds, and part of the Wright architecture site. Major centers of learning include the University of Chicago, University of Illinois, and Northwestern University. A wide variety of protected areas seek to conserve Illinois' natural and cultural resources. Three U.S. presidents have been elected while residents of Illinois: Abraham Lincoln, Ulysses S. Grant, and Barack Obama; additionally, Ronald Reagan was born and raised in the state. Illinois honors Lincoln with its official state slogan Land of Lincoln. The state is the site of the Abraham Lincoln Presidential Library and Museum in Springfield and the future home of the Barack Obama Presidential Center in Chicago.

Selected article

The Mormon Trail is the 1,300 mile (2,092 km) route that members of The Church of Jesus Christ of Latter-day Saints traveled from 1846 to 1868. Today the Mormon Trail is a part of the United States National Trails System, as the Mormon Pioneer National Historic Trail. The Mormon Trail extends from Nauvoo, Illinois, which was the principal settlement of the Latter Day Saints from 1839 to 1846, to Salt Lake City, Utah, which was settled by Brigham Young and his followers beginning in 1847. From Council Bluffs, Iowa, to Fort Bridger in Wyoming, the trail follows much the same route as the Oregon Trail and the California Trail.

The Mormon pioneer run began in 1846 when, Young and his followers were driven from Nauvoo, leaving to establish a new home for the church in the Great Basin. During the first few years, the emigrants were mostly former occupants of Nauvoo who were following Young to Utah. Later, the emigrants increasingly comprised converts from the British Isles and Europe. The trail was used for more than 20 years, until the completion of the First Transcontinental Railroad in 1869. (Read more...)

Selected biography

Paul Cornell
Paul Cornell

Paul Cornell (August 5, 1822 – March 3, 1904) was an American lawyer and Chicago real estate speculator who founded the Hyde Park Township that included most of what are now known as the south and far southeast sides of Chicago, Illinois. He turned the south side Lake Michigan lakefront area, especially the Hyde Park community area and neighboring Kenwood and Woodlawn neighborhoods, into a resort community that had its heyday from the 1850s through the early 20th century. He was also an urban planner who paved the way for and preserved many of the parks that are now in the Chicago Park District. Additionally, he was a successful entrepreneur with interests in manufacturing, cemeteries, and hotels. His modern legacy includes several large parks now in the Chicago Park District: Jackson Park, Washington Park, Midway Plaisance and Harold Washington Park. (Read more...)

Did you know...

  • ... that although Olga Hartman believed that her basic research on marine worms had no practical value, it was applied to experimental studies of oysters?
  • ... that Jack Washburn was called "Cinderella Boy" for winning a starring role in his first Broadway show?


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Environment: Ecoregions of IllinoisGeography of IllinoisGeology of IllinoisProtected areas of Illinois

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History: ChicagoIlliniwekIllinois CentralIllinois-Wabash CompanyIllinois TerritoryAbraham LincolnBlack Hawk WarCahokia1871 Great Chicago FireMakataimeshekiakiakMiamiMississippian cultureNorthwest TerritoryPotawatomiRoute 66Sauk

People: Governors of IllinoisMayors of ChicagoLongest Serving Mayor in IllinoisOrder of Lincoln Laureates

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