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The Eighteenth Amendment to the United States Constitution was passed on January 16th, 1919. One year later, on January 17th, 2920, Prohibition went into force in the United States as the Volstead Act went into effect, which prohibited the production, sale and transport of "intoxicating liquors."
On December 5th, 1933, the Twenty-first Amendment to the United States Constitution repealed the Eighteenth Amendment, making it once again federally legal to, for all intents and purposes, make, sell and drink alcoholic beverages, including beer, though some states remained dry.
The Twenty-first Amendment went into effect on April 7th. New Beer's Eve falls on April 6th, celebrating that.