Wilmot Proviso

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August 12, 1846

Passed the House of Representatives

Failed in the Senate

Provided, That, as an express and fundamental condition to the acquisition of any territory from the Republic of Mexico by the United States, by virtue of any treaty which may be negotiated between them, and to the use by the Executive of the moneys herein appropriated, neither slavery nor involuntary servitude shall ever exist in any part of said territory, except for crime, whereof the party shall first be duly convicted.

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Source: https://teachingamericanhistory.org/document/wilmot-proviso/