What was the Wilmot Proviso?

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The Wilmot Proviso was a legislative proposal put forth by Democratic Congressman David Wilmot of Pennsylvania in 1846. It stipulated that slavery be prohibited in any territory acquired in the negotiations with Mexico. The proposal passed the House of Representatives twice but was defeated both times in the Senate, as it was seen as a threat to the balance of power between free states and slave states. The Wilmot Proviso set off a fierce national debate over slavery and the expansion of the United States.

What Was the Wilmot Proviso