March 3, 1823 — An act of congress was approved authorizing the electors of the Territory of Michigan to choose eighteen by ballot at the next election of the delegate for that territory.

The evidence

• “By an act of congress, approved March 3, 1823, the electors of the Territory of Michigan were authorized to choose, by ballot, at the next election of the delegate for that territory, eighteen”

  1908-brown-rock-county/05-historic-evolution.md, Vol. 1, PDF p. 124 / book p. 110

  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