Women in the United States won the right to vote in the year 1920 with the ratification of the Nineteenth Amendment to the U.S. Constitution. The amendment was passed by Congress in 1919 and ratified by the necessary three- fourths of the states when Tennessee became the 36th state to approve it on August 18, 1920. The amendment was officially certified on August 26, 1920, guaranteeing that the right to vote could not be denied on account of sex