The influential activist known for her "Ain't I a Woman?" speech was Sojourner Truth. Delivered in 1851 at the Women's Rights Convention in Akron, Ohio, this powerful speech addressed the intersection of race and gender issues, highlighting the struggles of Black women in society. Truth's compelling rhetoric challenged prevailing notions of femininity and the rights of women, establishing her as a key figure in both the abolitionist movement and the early women's rights movement.