On January 9, 1918, President Woodrow Wilson announced his support of the amendment. The House of Representatives narrowly passed the amendment the next day, but the Senate refused to debate it until October. When the Senate voted on the amendment in October, it failed by three votes.
In response, the National Woman's Party urged citizens to vote against anti-suffrage Senators up for reelection in the 1918 midterm elections. Following those elections, most members of Congress were pro-suffrage. On May 21, 1919, the House of Representatives passed the amendment by a vote of 304 to 89 and the Senate followed suit on June 4, by a vote of 56 to 25.
On August 18, 1920, the Tennessee General Assembly, by a one-vote margin became the thirty-sixth state legislature to ratify the proposed amendment, making it the Nineteenth Amendment to the U.S. Constitution.