July 4, 1836
The territorial government of Wisconsin went into effect, and the authority of Michigan over the new territory ceased; the governor, secretary and judges took the oath of office at Mineral Point. One passage states the act was to take effect from and after the third day of July.
The regionGrade A · 1 independent source
The evidence
“On July 4, 1836, at Mineral Point in the new territory, the governor, secretary and judges took the oath of office and entered upon the discharge of their duties.”
1908-brown-rock-county/05-historic-evolution.md, Vol. 1, PDF p. 131 / book p. 117
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
On the printed page (Vol. 1, PDF p. 131 / book p. 117) · open the whole page