The main activist for women's suffrage in the United States was Susan B. Anthony. She was a prominent leader and advocate for women's rights and played a crucial role in the women's suffrage movement. Susan B. Anthony dedicated her life to fighting for women's suffrage and equality. She co-founded the National Woman Suffrage Association in 1869, which later merged with another organization to form the National American Woman Suffrage Association (NAWSA). Anthony traveled extensively, delivered speeches, organized campaigns, and tirelessly advocated for women's right to vote. Her contributions were instrumental in the eventual passage of the 19th Amendment to the United States Constitution, granting women the right to vote in 1920.