Attempted bill to ban slavery in gained US territory from Mexico.
Introduced by David Wilmot, it stated that slavery in all the territories gained from Mexico or the Treaty of Guadalupe Hidalgo will be banned. Failed to pass. It passed the House but failed the Senate because the South had greater representation.
Angered many; major cause of the Civil War. This plan suggested that slavery should not be allowed to exist in any of the territories that the U.S. could possibly gain from Mexico. Although this plan passed twice in the House of Representatives in was never fully agreed upon in the Senate, therefore it never became effective. All free states except one agreed with the conditions of the Wilmot Proviso. Later this "amendment" is seen as being the symbol of the slavery issue in the territories.