CHICAGO - JUNE 18: The city of Chicago was incorporated as a city in 1837. It is the third most populous metropolis in the United States. Pictured on June 18, 2011 in Chicago, Illinois.
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CHICAGO - JUNE 18: The city of Chicago was incorporated as a city in 1837. It is the third most populous metropolis in the United States. Pictured on June 18, 2011 in Chicago, Illinois.