Illinois is a midwestern state bordered to the east by Indiana and to the west by the Mississippi River. It is known as "the Prairie State" because of its farms, woods, rolling hills, and marshes. Chicago, one of the major cities in the United States, is located on the beaches of Lake Michigan in the northeast. It is well-known for its skyscrapers, including the elegant 1,451-foot Willis Tower and the neo-Gothic Tribune Tower.
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