February 17, 1842
The Territorial Legislature passed an act, approved February 17, authorizing Selvy Kidder, A. L. [and others; the passage is truncated] regarding the wants of the residents of Beloit.
BeloitGrade A · 1 independent source
The evidence
“In 1842, the Territorial Legislature, having been made aware of the wants of the residents of Beloit, in this direction, passed an act, which was approved February 17, authorizing Selvy Kidder, A. L.”
1879-history-of-rock-county/15-rock-county-ch09-beloit.md, PDF p. 631 / book p. 635
Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.
Grade A: Found on a page of one of our sources