Carrie Chapman Catt was an American women's suffrage leader who campaigned for the Nineteenth Amendment to the United States Constitution, which gave U.S. women the right to vote in 1920. Catt served as president of the National American Woman Suffrage Association from 1900 to 1904 and 1915 to 1920. She founded the League of Women Voters in 1920 and the International Woman Suffrage Alliance in 1904, which was later named International Alliance of Women. She "led an army of voteless women in 1919 to pressure Congress to pass the constitutional amendment giving them the right to vote and convinced state legislatures to ratify it in 1920". She "was one of the best-known women in the United States in the first half of the twentieth century and was on all lists of famous American women."

The Nineteenth Amendment to the United States Constitution prohibits the United States and its states from denying the right to vote to citizens of the United States on the basis of sex, in effect recognizing the right of women to vote. The amendment was the culmination of a decades-long movement for women's suffrage in the United States, at both the state and national levels, and was part of the worldwide movement towards women's suffrage and part of the wider women's rights movement. The first women's suffrage amendment was introduced in Congress in 1878. However, a suffrage amendment did not pass the House of Representatives until May 21, 1919, which was quickly followed by the Senate, on June 4, 1919. It was then submitted to the states for ratification, achieving the requisite 36 ratifications to secure adoption, and thereby go into effect, on August 18, 1920. The Nineteenth Amendment's adoption was certified on August 26, 1920.