Chicago

Chicago was incorporated as a city in 1837, near a portage between the Great Lakes and the Mississippi River watershed, and experienced rapid growth in the mid-nineteenth century. Today, the city is an international hub for finance, commerce, industry, technology, telecommunications, and transportation, with O'Hare International Airport being the second-busiest airport in the world; it also has the largest number of U.S. highways, and railroad freight entering its region.In 2012, Chicago was listed as an alpha global city by the Globalization and World Cities Research Network,and ranks seventh in the world in the 2014 Global Cities Index. As of 2012, Chicago had the third largest gross metropolitan product in the United States, after the New York City and Los Angeles metropolitan areas, at a sum of US$571 billion.