The National Woman Suffrage Association (NWSA) was formed on May 15, 1869, to work for women's suffrage in the United States. Its main leaders were Susan B. Anthony and Elizabeth Cady Stanton. It was created after the women's rights movement split over the proposed Fifteenth Amendment to the U. S. Constitution, which would in effect extend voting rights to black men. One wing of the movement supported the amendment while the other, the wing that formed the NWSA, opposed it, insisting that voting rights be extended to all women and all African Americans at the same time.

Women's suffrage, or the right to vote, was established in the United States over the course of more than half a century, first in various states and localities, sometimes on a limited basis, and then nationally in 1920 with the ratification of the 19th Amendment to the United States Constitution.