The Nineteenth Amendment to the United States Constitution, guaranteeing women the right to vote, was ratified on August 18, 1920, when Tennessee became the 36th state to approve it. Secretary of State Bainbridge Colby officially certified the amendment on August 26, 1920. This historic achievement represented the culmination of more than 70 years of struggle by the women's suffrage movement, granting American women full voting rights at the national level.