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Representative David Wilmot proposed the controversial amendment to the appropriations bill ending the Mexican War. Known as the Wilmot Proviso, his amendment would have prohibited slavery in any territory acquired from Mexico. Passed by the House, but not by the Senate—where southern opposition was stronger—the proviso intensified the sectionalism that precipitated the Civil War.
Records of the U.S. House of Representatives, National Archives and Records Administration
Provided that, as an express and fundamental condition to the acquisition of any territory from the Republic of Mexico, by the United States,… neither slavery nor involuntary servitude shall ever exist in any part of said territory