United States Statutes at Large/Volume 3/15th Congress/2nd Session/Resolution 1
1. Resolution declaring the admission of the state of Illinois into the Union.
Act of 18th April, 1818, ch. 67.Resolved, by the Senate and House of Representatives of the United States of America in Congress assembled, That, whereas, in pursuance of an act of Congress, passed on the eighteenth day of April, one thousand eight hundred and eighteen, entitled “An act to enable the people of the Illinois territory to form a constitution and state government, and for the admission of such state into the Union, on an equal footing with the original states,” the people of said territory did, on the twenty-sixth day of August, in the present year, by a convention called for that purpose, form for themselves a constitution and state government, which constitution and state government, so formed, is republican, and in conformity to the principles of the articles of compact between the original states and the people and states in the territory north-west of the river Ohio, passed on the thirteenth day of July, one thousand seven hundred and eighty-seven:Vol. i. 51.
Illinois a state of the Union, on an equal footing. Resolved, by the Senate and House of Representatives of the United States of America in Congress assembled, That the state of Illinois shall be one, and is hereby declared to be one, of the United States of America, and admitted into the Union on an equal footing with the original states, in all respects whatever.
Approved, December 3, 1818.