Chicago, Illinois

Crossroads of Middle America; Home of Al Capone; The Windy City. Population: 2,800,000

Chicago Firsts: roller skates, 1884 - steel frame skyscraper, 1885 - elevated railway, 1892 - zipper, 1896 - window envelope, 1902 - pinball game, 1930 - McDonald's Restaurant, 1955