HR 23, A bill for the admission of Kansas into the Union, 1860
In April, 1860 the House voted to admit Kansas as a free state under the Wyandot Constitution but pro-slavery Senators resisted. However, as southern states seceded from the Union and Senators from those states vacated their seats, the Senate was able to pass this bill granting Kansas statehood effective January 29, 1861. RG 46, Records of the U.S. House of Representatives