The political movement that sought to end slavery in the United States was the Abolitionist Movement. This grassroots campaign, gaining momentum in the 19th century, comprised various groups advocating for the immediate emancipation of enslaved people and the end of the institution of slavery. Prominent figures like Frederick Douglass, Harriet Tubman, and William Lloyd Garrison played pivotal roles in raising awareness and mobilizing support against slavery, contributing to the growing tensions that led to the American Civil War.