The Constitution
Nineteenth Amendment
The 1920 amendment barring denial of the vote on account of sex, after a campaign of more than seventy years.
In full
Ratified on the strength of a single vote in the Tennessee legislature, it prohibited sex-based denial of the franchise nationwide. It did not by itself enfranchise all women: Black women in much of the South remained blocked by the same devices used against Black men until the Voting Rights Act, and Native Americans were not uniformly citizens until 1924.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.