The U.S. Congress approves the Blaine Act to repeal federal Prohibition in the United States, sending the Twenty-first Amendment to the United States Constitution to state ratifying conventions for approval.

The United States Congress is the legislative branch of the federal government of the United States. It is a bicameral legislature, including a lower body, the U.S. House of Representatives, and an upper body, the U.S. Senate. They both meet in the United States Capitol in Washington, D.C.

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.

The Prohibition era was the period from 1920 to 1933 when the United States prohibited the production, importation, transportation, and sale of alcoholic beverages. The alcohol industry was curtailed by a succession of state legislatures, and Prohibition was formally introduced nationwide under the Eighteenth Amendment to the United States Constitution, ratified on January 16, 1919. Prohibition ended with the ratification of the Twenty-first Amendment, which repealed the Eighteenth Amendment on December 5, 1933.

The Twenty-first Amendment to the United States Constitution repealed the Eighteenth Amendment to the United States Constitution, which had mandated nationwide prohibition on alcohol. The Twenty-first Amendment was proposed by the 72nd Congress on February 20, 1933, and was ratified by the requisite number of states on December 5, 1933. It is unique among the 27 amendments of the U.S. Constitution for being the only one to repeal a prior amendment, as well as being the only amendment to have been ratified by state ratifying conventions.