The historical figure known for their role in securing women's suffrage in the U.S. is Susan B. Anthony. A prominent social reformer and activist, Anthony dedicated her life to advocating for women's rights, particularly the right to vote. She co-founded the National Woman Suffrage Association and played a crucial role in rallying support across various states. Anthony famously cast a ballot in the 1872 election, which led to her arrest. Her tireless efforts helped raise awareness and gain momentum for the women's suffrage movement, culminating in the eventual passage of the 19th Amendment in 1920, which granted women the right to vote.