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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.
Legislation concerning the legal minimum drinking age in the United States can be traced back to the days of prohibition. In 1920, the 18th amendment to the U.S. Constitution declared it illegal to manufacture, transport, or sell intoxicating liquors.he act was expressly upheld as constitutional in 1987 by the United States Supreme Court in South Dakota v. Dole. The United States is one of only five developed countries in the world that has a nationwide drinking age of over 18, with the other four being South Korea (19), Canada (19), Iceland (20), and Japan (20).