January 29, 1827
An act of congress was approved authorizing the electors of the territory to elect the members of the legislative council, without submitting names to the president for appointment.
Nation and worldGrade A · 1 independent source
The evidence
“By an act of congress, approved February 5, 1825, the legislative council was increased to thirteen members and by another act, approved January 29, 1827, the electors of the territory were authorized to elect the members of the council, without submitting names to the president for appointment.”
1908-brown-rock-county/05-historic-evolution.md, Vol. 1, PDF p. 125 / book p. 111
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