Detailing the history of the Abolitionist Movement in the United States, The Anti-Slavery Enterprise discusses the varying views of abolitionists, the idea of gradually abolishing slavery and more. In the 1700s, Thomas Jefferson added strong anti-slavery language to the Declaration of Independence, but these words were changed after a compromise with other writers and delegates. During his presidency, Jefferson outlawed the continued importation of slaves in 1808. In 1833, the American Anti-Slavery Society was founded by William Lloyd Garrison, and powerful literature from poets and authors like John Greenleaf Whittier and Harriet Beecher Stowe in the 1840s and 50s continued the spread of abolitionism. During the American Civil War, the Abolitionist Movement peaked and gained followers who believed wholeheartedly in the cause. With Lincoln's 1853 Emancipation Proclamation and the December 1865 passing of the Thirteenth Amendment to the U.S. Constitution, slavery was officially abolished in America.