William Lloyd Garrison was an abolitionist who sought immediate emancipation for all African Americans, an unusual idea for the 1830s when most of those who did support emancipation posed a gradual reform.
Influenced by Garrison's work, Theodore Dwight Weld, his wife Angelina Grimké and her sister Sarah Grimké wrote American Slavery As It Is: Testimony of a Thousand Witnesses, a book published in 1839, which spread antislavery ideas that helped start the Civil War.