The prominent female author and activist known for her work in women’s rights in the 19th century is Susan B. Anthony. She played a pivotal role in the women's suffrage movement and worked tirelessly for women's rights in the United States. Alongside Elizabeth Cady Stanton, she co-founded the National Woman Suffrage Association (NWSA) in 1869. Anthony’s activism included organizing petitions, giving speeches, and advocating for women's legal rights, particularly the right to vote. She famously cast a ballot illegally in the 1872 election, which led to her arrest. Her efforts significantly advanced the cause of women's rights in America.