Filming Of Transformers 3', Chicago, United States

Chicago was founded in 1833, near a portage between the Great Lakes and the Mississippi River watershed. The Potawatomi were forcibly removed from their land following the Treaty of Chicago. The city became a major transportation and telecommunications hub in North America. Today, the city retains its status as a major hub, both for industry and infrastructure, with O'Hare International Airport being the second busiest airport in the world. In 2008, the city hosted 45.6 million domestic and overseas visitors.
In modern times, the city has taken on an additional dimension as a center for business and finance and is listed as one of the world's top ten Global Financial Centers. Chicago is a stronghold of the Democratic Party and has been home to many influential politicians, including the current President of the United States, Barack Obama. The World Cities Study Group at Loughborough University rated Chicago as an "alpha world city" due to Chicago's important role in the global economic system.