February 1, 1848
The second constitutional convention completed the constitution and adjourned.
The evidence
“On the rejection of the first constitution, it became necessary to call another convention, which was held December 16th, 1847, and a constitution adopted in convention, February 1st, 1848; this was approved by the people at the election in the April following. The delegates to the second convention were E.”
1856-history-of-rock-county/01-wisconsin.md, PDF p. 21 / book p. 3
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. 21 / book p. 3) · open the whole page “Second Convention. — This body assemb'ed at Madison December 15, 1847, and adjourned February 1, 1848, having framed a Constitution which was adopted by the popular vote at an election held on the second Monday in March following. Members : Almerin M.”
1879-history-of-rock-county/10-rock-county-ch04-early-maps-courts-railroads.md, PDF p. 371 / book p. 375
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
On the printed page (PDF p. 371 / book p. 375) · open the whole page “mple, the delegates incorporated the homestead exemption into “the declaration of rights” section. An entire committee dedicated to banking devised a compromise resolution; it replaced constitutional bank prohibitions with a provision permitting legislature-proposed referenda for popular vote on banking issues. While abolitionists fervently sought Black suffrage again, the convention excluded any additional changes to the suffrage provisions. On Feb. 1, 1848, the convention delegates voted 60-9 in favor for the constitutional referendum to be submitted to popular vote. 15 Even as residents’ drive for statehood increased, public discussion and interest in the particulars of the proposed state government had waned. When the single ballot question was posed on March 13, 1848, 22,601 eligible voters approved the 1848 constitution referendum with 16,417 (72.6%) yeas and 6,184 nays (27.4%). Having accomplished the penultimate step toward statehood, the territorial leaders – with an approved state constitution a”
wisbar.org, https://www.wisbar.org/NewsPublications/WisconsinLawyer/Pages/Article.aspx?Volume=96&Issue=8&ArticleID=29991
Grade B: Found on an institutional web page