The American woman known for her work in civil rights and women's rights is Sojourner Truth. Born into slavery, she became an influential abolitionist and women's rights activist, famous for her powerful speeches, including "Ain't I a Woman?". Truth's efforts were pivotal in advocating for the intersection of racial and gender equality, as she passionately addressed the injustices faced by both African Americans and women. Her legacy continues to inspire modern movements for social justice and equality.