The abolitionist movement fought to end slavery in the United States during the 18th and 19th centuries. It involved diverse activists who challenged legal, political, and social systems upholding slavery through moral persuasion, political action, and direct intervention. Key figures like Frederick Douglass and Harriet Tubman led the charge, facing fierce opposition from pro-slavery forces. The movement shaped national discourse on race, contributed to the Civil War's outbreak, and left a lasting impact on American society and future civil rights struggles.