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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.
A law like the National Minimum Drinking Age Act of 1984 isnât without itâs own history, and it stems from as far back as prohibition. The 18th amendment in 1920 declaring alcohol illegal was repealed by the 21st amendment in 1933, which was followed quickly by a minimum legal drinking age of 21 in most states.