1834
Congress greatly increased the limits of the Territory of Michigan for judicial purposes by adding a large extent of country west of the Mississippi.
Nation and worldGrade A · 1 independent source
The evidence
“In 1834, Congress greatly increased the limits of the Territory of Michigan, by adding to it, for judicial purposes, a large extent of country west of the Mississippi — reaching south as far as”
1879-history-of-rock-county/01-wisconsin-antiquities-indians-territory.md, PDF p. 31 / book p. 35
Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.
Grade A: Found on a page of one of our sources