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Minimum Competence · Jul 17, 2026 · 7m

This Day in Legal History: The National Minimum Drinking Age Act

On July 17, 1984, President Ronald Reagan signed the National Minimum Drinking Age Act, the law that effectively set the drinking age at 21 across the entire country. What makes the Act a fixture of law-school classrooms isn’t the policy itself—it’s the clever, and constitutionally fraught, mechanism Congress used to achieve it.

Here’s the problem Congress faced. Setting a drinking age is a classic exercise of state police power; the federal government has no general authority to tell states how old someone must be to buy a…