The influential female figure who campaigned for the abolition of slavery in the United States was Sojourner Truth. Born into slavery, she became a prominent abolitionist and women’s rights advocate, known for her powerful speeches and advocacy for racial and gender equality. Her famous speech, "Ain't I a Woman?", delivered in 1851, challenged prevailing notions of womanhood and highlighted the intersection of race and gender in the fight for rights. Sojourner Truth's activism played a critical role in shaping social movements in 19th-century America.