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By 1916, over half of the U.S. states already had statutes that prohibited alcohol. In 1919, the 18th Amendment to the U.S. Constitution, which prohibited the sale and manufacture of alcohol, was ratified. It went into effect on January 16, 1920.
Confidence votes 3.6K. Alcohol was legal in the united states from 1776 to 1920. It was made illegal by the 18th amendment to the constitution, when prohibition was declared. In 1933, the U.S. Congress ratified the 21st amendment, which repealed prohibition and legalized the sale and consumption of alcohol.