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Chicago ( /ʃɨˈkɑːɡoʊ/ (help·info) or /ʃɨˈkɔːɡoʊ/) is the largest city in the U.S. state of Illinois...

Chicago ( /ʃɨˈkɑːɡoʊ/ (help·info) or /ʃɨˈkɔːɡoʊ/) is the largest city in the U.S. state of Illinois, and with more than 2.8 million people, the 3rd largest city in the United States. Located on the southwestern shores of Lake Michigan, Chicago is the third-most densely populated major city in the U.S., and anchor to the world's 26th largest metropolitan area with over 9.5 million people across three states. After a series of wars with the local Native Americans, Chicago was founded in 1833, near a portage between the Great Lakes and the Mississippi River watershed. The city became a major transportation and telecommunications hub in North America. Today, the city retains its status as a major hub, both for industry and infrastructure, with its O'Hare International Airport as the second busiest airport in the world. In modern times, the city has taken on an additional dimension as a center for business and finance and is listed as one of the world's top ten Global Financial Centers. Chicago is a stronghold of the Democratic Party and has been home to influential politicians, including the current President of the United States, Barack Obama. The World Cities Study Group at