The movement that sought to abolish slavery in the United States was known as the abolitionist movement. This grassroots movement gained momentum in the 19th century, driven by activists like Frederick Douglass, Harriet Tubman, and Sojourner Truth, among others. Abolitionists campaigned for the end of slavery through various means, including literature, public speaking, and organizing underground networks like the Underground Railroad. Their efforts culminated in significant legal and social changes, leading to the Emancipation Proclamation in 1863 and the 13th Amendment in 1865, which ultimately outlawed slavery across the nation.