Chicago Loop is the second largest commercial business district in the US, after New York City's Midtown Manhattan.
It is home to financial institutions, stock markets and banks, as well as the headquarters of many international companies.
It is the seat of city government but also boasts retail and entertainment amenities.
Chicago has a very diversified economy, featuring everything from manufacturing to web start-up companies.
It continues to be a major transportation and distribution center and a popular venue for conventions.
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