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Chicago is the most populous city in the U.S. state of Illinois and in the Midwestern United States. In the U.S., Chicago is the center of the Chicago metropolitan area, which is often colloquially called "Chicagoland".Chicago is an international hub for finance, culture, commerce, industry, education, technology, telecommunications, and transportation. It has the largest and most diverse derivatives market in the world, generating 20% of all volume in commodities and financial futures alone. O'Hare International Airport is routinely ranked among the world's top six busiest airports by passenger traffic.