Wisconsin was admitted into the Union.

The evidence

• “May 29th, 1848, Wisconsin was admitted into the Union.”

  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