The famous American suffragette known for her activism was Susan B. Anthony. She played a pivotal role in the women's suffrage movement, advocating for women's rights to vote in the United States during the late 19th century. Through her tireless efforts, she co-founded the National Women's Suffrage Association and other organizations aimed at securing legal and social equality for women. Anthony's activism included organizing rallies, delivering speeches, and even voting illegally in the 1872 presidential election to challenge the status quo. Her legacy is honored today as a pioneering figure in the fight for women's rights and civil liberties.