Illinois is a state of the United States of America and the 21st state admitted to the Union. Illinois is the most populous state in the Midwest and the fifth most populous in the nation, and has a large and cosmopolitan population. Its balance of vast suburbs and the great metropolis of Chicago in the northeast, rural areas, small industrial cities, and renowned agricultural productivity in central and western Illinois, and the coal mines of the south give it a highly diverse economic base. Its central location, connecting the Great Lakes to the Mississippi River via the Illinois River, made it a transportation hub for 150 years. It is this mixture of factory and farm, of urban and rural, that makes Illinois a microcosm of the United States.
About 2,000 Native American hunters and a small number of French villagers inhabited the area at the time of the American Revolution. American settlers began arriving from Kentucky in the 1810s; they achieved statehood in 1818. Yankees arrived a little later and dominated the north, founding the future metropolis of Chicago in the 1830s. The coming of the railroads in the 1850s made highly profitable the rich prairie farmlands in central Illinois, attracting large numbers of immigrant farmers from Germany and Sweden. Northern Illinois provided major support for Illinoisans Abraham Lincoln and Ulysses S. Grant during the American Civil War. By 1900, factories were being rapidly built in the northern cities, along with coal mines in central and southern areas. This industrialization attracted large numbers of immigrants from Eastern and Southern Europe, and also led to the state's material contribution as a major arsenal in both world wars. In addition to immigrants from Europe, large numbers of blacks left the cotton fields of the South to come to Chicago, where they developed a famous jazz culture.
The state is named for the French adaptation of an Algonquian language (perhaps Miami) word apparently meaning "s/he speaks normally" (Miami ilenweewa, Proto-Algonquian *elen-, "ordinary" and -we, "to speak"). Alternately, the name is often associated with the indigenous Illiniwek people, a consortium of Algonquian tribes that thrived in the area. The name Illiniwek is frequently (incorrectly) said to mean "tribe of superior men"; in reality, it only means "men."
Cahokia, the urban center of the pre-Columbian Mississippian culture, was located near present-day Collinsville, Illinois. That civilization vanished in the 15th century for unknown reasons. The next major power in the region was the Illiniwek Confederation, or Illini, a political alliance among several tribes. There were about 25,000 Illinois Indians in 1700, but systematic attacks and genocide by the Iroquois reduced their numbers 90%. Members of the Potawatomi, Miami, Sauk, and other tribes came in from the east and north. In the American Revolution, the Illinois and Potawatomi supported the American cause.
French explorers Jacques Marquette and Louis Joliet explored the Illinois River in 1673. As a result of their exploration, Illinois was part of the French empire until 1763, when it passed to the British. The small French settlements continued; a few British soldiers were posted in Illinois but there were no British or American settlers. In 1778 George Rogers Clark claimed the Illinois Country for Virginia. The area was ceded by Virginia to the new United States in 1783 and became part of the Northwest Territory.
The Illinois-Wabash Company was an early claimant to much of Illinois. The Illinois Territory was created on February 3, 1809, with its capital at Kaskaskia. In 1818, Illinois became the 21st U.S. state after exaggerating its population totals. The new state debated slavery then rejected it, as settlers poured into southern Illinois from Kentucky.
Thanks to Nathaniel Pope, the delegate from Illinois, Congress shifting the northern border 41 miles north to 42° 30' north, which added 8,500 square miles to the state, including Chicago, Galena and the lead mining region. The capital remained at Kaskaskia, but in 1819 it was moved to Vandalia. In the 1832 Black Hawk War Indians who had removed to Iowa attempted to return, but were defeated by the militia and forced back to Iowa.
The winter of 1830-1831 is called the "Winter of the Deep Snow." A sudden, deep snowfall blanketed the state, making travel impossible for the rest of the winter. Many travellers perished. Several severe winters followed, including the "Winter of the Sudden Freeze." On December 20, 1836, a fast-moving cold front passed through, freezing puddles in minutes and killing many travelers who could not reach shelter. The adverse weather resulted in crop failures in the northern part of the state. The southern part of the state shipped food north and this may have contributed to its name: "Little Egypt", after the Biblical story of Joseph in Egypt supplying grain to his brothers.
Illinois is known as the "Land of Lincoln" because it is here that the 16th President spent most of his life, practicing law and living in Springfield. In 1837, with Lincoln's support and urging, the General Assembly voted to move the capital to Springfield. As early as 1840, Illinois was called the "Sucker State." Illinois was not a strong anti-slavery state. In 1853, led by Democrat John A. Logan, the legislature passed a Black Code designed to keep free blacks out of the state.
By 1839 the Mormon utopian city of Nauvoo, located on the Mississippi River, was created and settled, and flourished. In 1844 the Mormon leader Joseph Smith was killed in an Illinois jail. After close to six years of rapid development the Mormon city of Nauvoo, which rivaled Chicago as Illinois' largest city, saw a rapid decline. In 1846 the Mormons had left Illinois for the West in a mass exodus.
Chicago gained prominence as a Great Lakes port and then as an Illinois and Michigan Canal port after 1848, and as a rail hub soon afterward. By 1857, Chicago was Illinois' largest city.
During the American Civil War, over 250,000 Illinois men served in the Union Army, more than any other northern state except New York, Pennsylvania, and Ohio. Beginning with President Lincoln's first call for troops and continuing throughout the war, Illinois mustered 150 infantry regiments, which were numbered from the 7th to the 156th regiments. Seventeen cavalry regiments were also gathered, as well as two light artillery regiments.
In the 20th century, Illinois emerged as one of the most important states in the union with a population of nearly 5 million. By the end of the century, the population would reach 12.4 million. The Century of Progress world's fair was held at Chicago in 1933. Oil strikes in Marion County and Crawford County lead to a boom in 1937, and, by 1939, Illinois ranked 4th in U.S. oil production.
Following World War II, Argonne National Laboratory, near Chicago, activated the first experimental nuclear power generating system in United States in 1957. By 1960, the first privately financed nuclear plant in United States, Dresden 1, was dedicated near Morris. Chicago became an ocean port with the opening of the Saint Lawrence Seaway, in 1959. The seaway and the Illinois Waterway connected Chicago to both the Mississippi River and the Atlantic Ocean. In 1960, Ray Kroc opened the first McDonald's franchise in Des Plaines.
In 1970, the state's sixth constitutional convention authored a new constitution to replace the 1870 version. It was ratified in December. The first Farm Aid concert was held in Champaign to benefit American farmers, in 1985. The worst upper Mississippi River flood of the century, the Great Flood of 1993, inundated many towns and thousands of acres of farmland.
