What amendment imposed the federal prohibition of alcohol in the US?

The Prohibition Era began in 1920 when the 18th Amendment to the U.S. Constitution, which banned the manufacture, transportation, and sale of intoxicating liquors, went into effect with the passage of the Volstead Act. n early 1933, Congress adopted a resolution proposing a 21st Amendment to the Constitution that would repeal the 18th. The 21st Amendment was ratified on December 5, 1933, ending Prohibition.

Source: History.com