For America's 250th anniversary, which amendment recognized women's constitutional right to vote in 1920?

The Nineteenth Amendment recognized women's constitutional right to vote in 1920.

Congress proposed the amendment on June 4, 1919, and Tennessee supplied the decisive 36th ratification on August 18, 1920. The amendment prohibits the federal government and the states from denying citizens the vote on the basis of sex. Its adoption was certified on August 26, now observed in the United States as Women’s Equality Day.

The amendment was the result of a decades-long suffrage movement. Activists including Susan B. Anthony, Elizabeth Cady Stanton, Carrie Chapman Catt, Alice Paul, and many others organized petitions, conventions, campaigns, protests, and legal challenges. The 1848 Seneca Falls Convention helped make women’s voting rights a central reform demand.

Ratification did not eliminate every barrier to voting. Many women of color continued to face discriminatory laws and practices, including poll taxes, literacy tests, and citizenship restrictions. Native American women also encountered separate obstacles to citizenship and voting. The amendment was therefore a major constitutional milestone, but voting equality continued to require further legal and political struggles.