April 1836
Congress passed an act organizing the Territory of Wisconsin; other passages date the act precisely to April 20, 1836.
The evidence
“In April, 1836, Congress passed an act organizing the Territory of Wisconsin, which was fully carried into effect July 4th, 1836, and which included the country west of the Mississippi and north of the State of Missouri.”
1856-history-of-rock-county/01-wisconsin.md, PDF p. 21 / book p. 3
Guernsey, Orrin, and Josiah F. Willard, editors. History of Rock County, and Transactions of the Rock County Agricultural Society and Mechanics' Institute. Janesville, Wis.: William M. Doty & Brother, 1856. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871593.
Grade A: Found on a page of one of our sources
On the printed page (PDF p. 21 / book p. 3) · open the whole page “8. Wisconsin territory was formed April 20, 1836. The state was formed May 29, 1848.”
1879-history-of-rock-county/04-wisconsin-railroads-commerce-health-statistics.md, PDF p. 215 / book p. 219
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
On the printed page (PDF p. 215 / book p. 219) · open the whole page
