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Capital: Springfield ยท Midwest ยท Admitted 1818

Chicago reversed a river. Until 1900 the Chicago River carried the city's sewage straight into Lake Michigan, which was also its drinking supply. Engineers cut a canal to the Des Plaines River and flipped the current so the river now runs away from the lake and toward the Mississippi, one of the largest earthmoving jobs ever attempted by a city.

About these facts: Curated and verified against multiple sources. Updated periodically. If you spot an inaccuracy, email [email protected].

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Where the name comes from

Illinois is a French spelling of the name the French applied to the Illinois or Illiniwek confederation they met in the upper Mississippi valley. Linguists trace the word back through Ojibwe to a Miami Illinois term meaning roughly he speaks the ordinary way.

The final s is silent because the spelling is French, not English, and that trips up newcomers on day one. The same French layer left Des Plaines, Bourbonnais and Joliet on the map, though local pronunciation has drifted a long way from Paris.

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Frequently asked questions

What is Illinois known for?

Illinois is known for Chicago, where the steel framed skyscraper started in 1885 and the Ferris wheel debuted in 1893, for Abraham Lincoln's political career in Springfield, and for agriculture: the state leads the country in pumpkins and ranks at the top in corn and soybeans. The first controlled nuclear chain reaction also took place at the University of Chicago in 1942.

Why is Chicago called the Windy City?

Not because of weather. Nineteenth century writers used the phrase for the city's long winded boosters and politicians, and it stuck during the campaign to host the 1893 World's Fair. By average wind speed Chicago does not rank in the top ten American cities.

What is the weirdest law in Illinois?

Chicago has banned the sale of spray paint inside city limits since 1992, an anti graffiti ordinance that survived a court challenge. Residents who want a can drive to the suburbs for it.

Why is Springfield the capital of Illinois instead of Chicago?

Illinois moved its capital twice. Kaskaskia held it in 1818, Vandalia from 1819, and Springfield won it in 1839 after a bloc of nine legislators, including Abraham Lincoln, lobbied for the move. Chicago was still a small settlement at the time.

How do you pronounce Illinois?

Il-uh-NOY. The final s is silent because the name comes through French. The same rule applies to Des Plaines, though several Illinois town names with French spellings are now said in ways no French speaker would recognize.