found: Wikipedia, July 25, 2007 (under Illinois Territory: Illinois Territory was a historic, organized territory of the U.S. est. on Mar. 1, 1809. A portion the area was accepted into the Union as the State of Illinois on Dec. 3, 1818, at which time the Territory ceased to exist; Illinois Territory originally included areas that became the states of Illinois, Wisconsin, the eastern portion of Minnesota, and the western portion of the upper peninsula of Michigan. As Illinois was preparing to become a state, the remaining area of the territory was attached to the Michigan Territory and ceased using the name Illinois Territory; under Illinois: The Illinois Territory was created on Feb. 3, 1809, with its capital at Kaskaskia. In 1818, Illinois became the 21st U.S. state)
Illinois
