1846
A town (not named in the passage) that had been part of Union was organized into a separate town by legislative act.
Nation and worldGrade A · 1 independent source
The evidence
“Was at first included in the organization of, and constituted a part of Union. In 1846—by Legislative act it was organized into a separate town”
1856-history-of-rock-county/17-porter.md, PDF p. 133 / book p. 115
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
On the printed page (PDF p. 133 / book p. 115) · open the whole page