The area north and east of Lake Michigan, organized in 1805 as Michigan Territory, was first organized in 1796 as Wayne County of the Northwest Territory. In 1800 the western half of the county, and in 1803 the eastern half, became parts of Indiana Territory, and so remained until July 1805. In 1818 Michigan Territory was expanded westward so as to include all of the area north of Illinois to the Mississippi River.
William W. Blume,
Criminal Procedure on the American Frontier: A Study of the Statutes and Court Records of Michigan Territory 1805-1825,
Mich. L. Rev.
Available at: https://repository.law.umich.edu/mlr/vol57/iss2/3
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