The Blaine Act, formally titled Joint Resolution Proposing the Twenty-First Amendment to the United States Constitution, is a joint resolution adopted by the United States Congress on February 20, 1933, initiating repeal of the 18th Amendment to the United States Constitution, which established Prohibition in the United States. Repeal was finalized when the 21st Amendment to the Constitution was ratified by the required minimum number of states on December 5, 1933.