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Illinois is a state of the United States of America and the 21st state admitted to the Union. Illinois is the most populous state in the Midwest and the fifth most populous in the nation, and has a large and diverse population. The balance of vast suburbs in Illinois and the great metropolis of Chicago in the northeast, rural areas, small industrial cities, and renowned agricultural productivity in central and western Illinois, and the coal mines of the south give Illinois a highly diverse economic base. The central location of Illinois, connecting the Great Lakes to the Mississippi River via the Illinois River, made it a transportation hub for 150 years. It is this mixture of factory and farm, of urban and rural, that makes Illinois a microcosm of the United States.