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On December 3, 1818, Illinois became the 21st state of the United States of America. Before statehood, it was called the Illinois Territory. It had been formed from the same Northwest Territory from which the Ohio and the Indiana Territories had been formed and admitted to respective statehood on March 1, 1803.

Illinois was admitted into the Union on December 3, 1818 becoming the 21st state to join the union.

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