The Treaty of Greenville (1795) by which Indian tribes of the Northwest Territory ceded to the United States the eastern and southern parts of the area which later became the state of Ohio, provided that certain small areas north and west of the treaty line should also be ceded.
William W. Blume,
Civil Procedure on the American Frontier,
Mich. L. Rev.
Available at: https://repository.law.umich.edu/mlr/vol56/iss2/2