"An act in relation to the formation of a state government in Wisconsin" was approved; it authorized a census and the election of delegates to a constitutional convention (the 1879 history describes the same act's provisions without a date).

The evidence

• “The fifth legislative assembly of the Territory of Wisconsin met at Madison on the fifth day of January, 1846. The first act passed at that session was entitled "An act in relation to the formation of a state government in Wisconsin." It was approved January 31, 1846. The act authorized the taking of a census and the election of delegates to a constitutional convention.”

  1908-brown-rock-county/05-historic-evolution.md, Vol. 1, PDF p. 138 / book p. 123

  Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.

  Grade A: Found on a page of one of our sources