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Prohibition begins in the United States

On this day · 16 January 1920
40 sec read

A constitutional ban on America's drinks took effect one year to the day after it was ratified, and the speakeasies were ready.

Verified · Ronald Reagan Presidential Library (NARA)

The 18th Amendment was ratified on January 16, 1919, and by its own terms it switched on exactly one year later. On January 16, 1920, national Prohibition took effect, outlawing the manufacture, sale, and transportation of intoxicating liquors across the United States.

The amendment itself was short and said nothing about what counted as “intoxicating.” That job fell to the Volstead Act, passed over President Woodrow Wilson’s veto in October 1919, which set the legal line at any beverage above 0.5 percent alcohol, a threshold strict enough to sweep in ordinary beer and wine.

The ban was meant to sober up the nation. Instead it pushed drinking underground, seeding speakeasies, bootlegging fortunes, and well-organized crime. The experiment lasted nearly 14 years before the 21st Amendment repealed it in December 1933, the only time an amendment has been undone by another.

0.5%
alcohol = illegal
~14 yrs
Prohibition lasted
1933
repealed

Sources & references

2 references

Well-established. Corroborated by 2 independent sources.

1 Ronald Reagan Presidential Library (NARA) government archive “The 18th Amendment was ratified January 16, 1919, and Prohibition took effect one year after ratification (January 16, 1920), banning the manufacture, sale, or transportation of intoxicating liquors; the Volstead Act of October 28, 1919, defined what counted as illegal alcohol.” reaganlibrary.gov ↗
2 ATF (Bureau of Alcohol, Tobacco, Firearms and Explosives) government agency “The 18th Amendment and the National Prohibition (Volstead) Act established national prohibition of intoxicating liquors, with the Volstead Act defining what qualified as illegal alcohol for beverage purposes.” atf.gov ↗
✓ Last reviewed Jun 7, 2026

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