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State of Illinois
Flag of Illinois Seal Nickname(s): Land of Lincoln; The Prairie State Motto(s): State sovereignty, national union
Official language(s)	English[1]
Capital	Springfield
Largest city	Chicago
Largest metro area	Chicago Metropolitan Area
Area	Ranked 25th
- Total	57,918 sq mi (140,998 km²)
- Width	210 miles (340 km)
- Length	390 miles (629 km)
- % water	4.0
- Latitude	36° 58′ N to 42° 30′ N
- Longitude	87° 30′ W to 91° 31′ W
Population	Ranked 5th
- Total	12,831,970[2]
- Density	223.4/sq mi  86.27/km² (11)
- Median income	$45,787[3] (18)
Elevation
- Highest point	Charles Mound[4] 1,235 ft  (377 m)
- Mean	600 ft  (182 m)
- Lowest point	Mississippi River[4] 279 ft  (85 m)
Admission to Union	December 3, 1818 (21st)
Governor	Rod Blagojevich (D)
U.S. Senators	Richard Durbin (D) Barack Obama (D)
Congressional Delegation	List
Time zone	Central: UTC-6/-5
Abbreviations	IL US-IL
Web site	www.illinois.gov

The State of Illinois (pronounced IPA: /ˌɪlɨˈnɔɪ/ Ill-i-NOY) is a state of the United States of America, the 21st to be admitted to the Union. Illinois is the most populous and demographically diverse^[5] Midwestern state and the fifth most populous in the nation. With Chicagoland in the northeast, small industrial cities and great agricultural productivity in central and western Illinois, and natural resources like coal, timber, and petroleum in the south, Illinois has a broad economic base. Illinois is an important transportation hub; the Port of Chicago connects the Great Lakes to the Mississippi River via the Illinois River. Illinois is often viewed as a microcosm of the United States; an Associated Press analysis of 21 demographic factors determined Illinois was the "most average state,"^[6] while the city of Peoria has long been a proverbial social and cultural bellwether.

Between 1300 and 1400 AD, the Mississippian city of Cahokia had a population of around 40,000, making it the largest city within the future United States until it was surpassed by Philadelphia in the 1800s. About 2,000 Native American hunters and a small number of French villagers inhabited the Illinois area at the time of the American Revolution.^[7] American settlers began arriving from Kentucky in the 1810s; they achieved statehood in 1818. The future metropolis of Chicago was founded in the 1830s on the banks of the Chicago River, one of the only natural harbors on southern Lake Michigan.^[8] Railroads and John Deere's invention of the self-scouring steel plow made central Illinois' rich prairie into some of the world's most productive and valuable farmlands, attracting 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, the growth of industry in northern cities and coal mining in central and southern areas attracted immigrants from Eastern and Southern Europe, and also made the state a major arsenal in both world wars. In addition, large numbers of blacks migrated to Chicago from the South, where they formed a large community and created the city's famous jazz and blues cultures.

==Geography==<a href="http://photobucket.com" target="_blank"><img src="http://img.photobucket.com/albums/v624/Chrissyface/PEACEEE.gif" border="0" alt="Photo Sharing and Video Hosting at Photobucket"></a>

Chicago, the largest city in Illinois, as viewed from the John Hancock Center

Main article: Geography of Illinois

See also: List of Illinois counties and List of Illinois county name etymologies

The state is named for the French adaptation of an Algonquian language (perhaps Miami) word apparently meaning "s/he speaks normally" (Miami ilenweewa,^[9][10] Proto-Algonquian *elen-, "ordinary" and -we·, "to speak").^[11] 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";^[12] in reality, it only means "men".^[13][14][15]

The eastern border of Illinois is Lake Michigan. Its eastern border with Indiana is all of the land west of the Wabash River, and a north-south line above Post Vincennes, or 87° 31′ 30″ west longitude. Its northern border with Wisconsin is fixed at 42° 30' north latitude. Its western border with Missouri and Iowa is the Mississippi River. Its southern border with Kentucky is the Ohio River.^[16] Illinois also borders Michigan, but only via a water boundary in Lake Michigan.^[17]

Though Illinois lies entirely in the Interior Plains, it has three major geographical divisions. The first is Northern Illinois, dominated by the Chicago metropolitan area, including the city of Chicago, its suburbs, and the adjoining exurban area into which the metropolis is expanding. As defined by the federal government, the Chicago metro area includes a few counties in Indiana and Wisconsin and stretches across much of northeastern Illinois. It is a cosmopolitan city, densely populated, industrialized, and settled by a wide variety of ethnic groups. The city of Rockford generally sits along Interstates 39 and 90 and is the state's third largest city

Southward and westward, the second major division is Central Illinois, an area of mostly flat prairie. Known as the Heart of Illinois, it is characterized by small towns and mid-sized cities. The western section (west of the Illinois River) was originally part of the Military Tract of 1812 and forms the distinctive western bulge of the state. Agriculture, particularly corn and soybeans, as well as educational institutions and manufacturing centers, figure prominently. Cities include Peoria—the third largest metropolitan area in Illinois at 370,000—Springfield—the state capital—Quincy, Decatur, Bloomington-Normal and Champaign-Urbana.^[17]

Illinois, showing major cities and roads

The third division is Southern Illinois, comprising the area south of U.S. Route 50, and including Little Egypt, near the juncture of the Mississippi River and Ohio River. This region can be distinguished from the other two by its warmer climate, different mix of crops (including some cotton farming in the past), more rugged topography (the southern tip is unglaciated with the remainder glaciated during the Illinoian Age and earlier ages), as well as small-scale oil deposits and coal mining. The area is a little more populated than the central part of the state with the population centered in two areas. First, the Illinois suburbs of St. Louis comprise the second most populous metropolitan area in Illinois with nearly 600,000 inhabitants, and are known collectively as the Metro-East. The second area is Williamson County, Jackson County, Franklin County, Saline County and Perry County. It is home to around 210,000 residents.^[17]

The region outside of the Chicago Metropolitan area is often described as "downstate Illinois". However, residents of central and southern Illinois view their regions as geographically and culturally distinct, and do not necessarily use this term.

In extreme northwestern Illinois, the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, has the state's highest elevation above sea level at 1,235 feet (376 m). The highest structure in Illinois is the Sears Tower with a roof elevation of approximately 2,030 feet (619 m) above sea level. [Chicago elevation (580 ft) + tower height (1450) = 2030.]

The floodplain on the Mississippi River from Alton to the Kaskaskia River is the American Bottom, and is the site of the ancient city of Cahokia. It was a region of early German settlement, as well as the site of the first state capital, at Kaskaskia which is separated from the rest of the state by the Mississippi River.^[18][17]

Climate

Because of its nearly 400 mile (640 km) length and mid-continental situation, Illinois has a widely varying climate. Most of Illinois has a humid continental climate (Koppen climate classification Dfa) with hot, humid summers and cool to cold winters. The southernmost part of the state, from about Carbondale southward, borders on a humid subtropical climate (Koppen Cfa) with more moderate winters. Average yearly precipitation for Illinois varies from just over 48 inches (1,220 mm) at the southern tip to around 35 inches (890 mm) in the northern portion of the state. Normal annual snowfall exceeds 38 inches (96 cm) in Chicagoland, while the southern portion of the state normally receives less than 14 inches (35 cm).^[19] The highest temperature recorded in Illinois was 117 °F (47 °C), recorded on July 14, 1954, at East St. Louis, while the lowest temperature was -36 °F (-38 °C), recorded on January 5, 1999, at Congerville.^[20][18][17]

Illinois averages around 50 days of thunderstorm activity a year which put it somewhat above average for number of thunderstorm days for the United States. Illinois is vulnerable to tornadoes with an average of 35 occurring annually, which puts much of the state at around 5 tornadoes per 10,000 square miles (30,000 km²) annually.^[21] The deadliest tornado on record in the nation occurred largely in Illinois. The Tri-State Tornado of 1925 killed 695 people in three states; 613 of the victims lived in Illinois.^[22]

Recreation

See also: List of protected areas of Illinois

Illinois has numerous museums. The state of the art Abraham Lincoln Presidential Library and Museum in Springfield is the largest presidential library in the