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Illinois is home to the world’s first aquarium, the first skyscraper and Willis Tower, the tallest building on the US continent. Bordering the Great Lakes, the Illinois River links them with the Mississippi River. This northern state is the fifth most populous state in America, with Chicago, Springfield, Rockford and Aurora all having huge city populations. Chicago’s O’Hare airport is one of the busiest in the world and is the hub for United and American Airlines.

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