Repeals the 18th Amendment and makes it a federal offense to transport or import intoxicating liquors into U.S. states and territories where prohibited by law. Proposed February 20, 1933; ratified December 5, 1933, 9 months later. The Twenty-first Amendment to the United States Constitution repealed the Eighteenth Amendment to the United States Constitution, which had mandated nationwide prohibition on alcohol.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. Wiki link