Chicago - Wikipedia
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Chicago (/SI’ka:goU/ (listen), shih–KAH-goh; locally, /SI’ko:goU/ Shih-KAW–goh), also known as the City of Chicago is the largest city in Illinois and third in the United States. It follows New York City, Los Angeles, and New York City. It is the fifth-most populous North American city and the largest city in the Midwestern United States, with a population of 2,746,388 as per the 2020 census. Chicago is the county seat for Cook County, which is also the second most populous U.S. county. A small part of O'Hare International Airport extends into DuPage County. Chicago is the main city of the Chicago metropolitan region. This area can be defined as either the U.S. Census Bureau’s metropolitan statistical area (9.6 millions people) or the combined statistic area (10 million residents), also known as Chicagoland. It is home to 40 of the largest urban areas worldwide.
Chicago is located on the shores Lake Michigan's freshwater lake. It was established as a city in 1837, near the portage of the Great Lakes to the Mississippi River. It grew quickly in the middle of the 19th century. By 1860, Chicago had surpassed 100,000 people.  After the Great Chicago Fire of 1871, which destroyed many square miles and made more than 100,000 homeless, Chicago's total population increased to 503,000 in 1880. Then it doubled to over a million by the end of the decade. The boom in construction accelerated the city's population growth over the next 30 years. Chicago was the fifth largest city in the world by 1900, just 30 years after the fire.  Chicago was a notable contributor to urban planning and zoning standards. This included new construction styles (including Chicago School of Architecture), the creation of the City Beautiful Movement and the steel-framed skyscraper.