Answer:
The 19th amendment .
Step-by-step explanation:
Beginning in the 1800s women organized petitions to win the right to vote, but it took them a lot of time to accomplish their purpose. By 1916, the suffrage organizations were united wanting the constitutional amendment to be a success. President Wilson changed his position to support an amendment in 1918 and On May 21, 1919, the House of Representatives passed the amendment and after two weeks the Senate also passed the amendment. The amendment was passed by Congress June 4, 1919, and ratified on August 18, 1920, the 19th amendment granted women the right to vote.