On June 4, 1919 House Joint Resolution 1, proposing a Constitutional amendment extending the right to vote to women, passed the Senate. HJ Res 1 had passed in the House on May 21. Once the proposed amendment passed Congress, it was sent to states for ratification. On August 26, 1920 the amendment was ratified and became part of the U.S. Constitution.
House Joint Resolution 1, 5/19/1919, HR 66A-B6, Records of the U.S. House of Representatives (ARC 1633885)