This detailed study of the Wilmot Proviso controversy of the late 1840s analyzes the debate that drew the theoretical battle lines concerning slavery in the territories and that led eventually to the secession of the Southern states and the Civil War. Morrison illuminates the meaning of this crucial territorial issue by a treatment of its relationship to the politics of the Democratic party from 1845 to 1848. Originally published in 1967. A UNC Press Enduring Edition -- UNC Press Enduring Editions use the latest in digital technology to make available again books from our distinguished backlist that were previously out of print. These editions are published unaltered from the original, and are presented in affordable paperback formats, bringing readers both historical and cultural value.