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Secondary sourceDocument1846

Wilmot Proviso

David Wilmot · 1846

A failed 1846 congressional proposal to ban slavery in territory won from Mexico, which set off the sectional crisis that dominated Taylor's presidency.

The territorial slavery dispute sparked by this 1846 proposal defined the political crisis Taylor had to manage as president.

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Map of the United States in 1846 showing slave states in red, free states in blue, and territories including Oregon Country and Unorganized Territory. A legend box and a note on the Wilmot Proviso of 1846 appear on the left, and a table of state counts by year is at the bottom.
Map illustrating the Wilmot Proviso of 1846 and the division of slave and free territory.

About this source

What it is

The Wilmot Proviso was a proposal introduced in Congress in 1846 by David Wilmot, a Democratic congressman from Pennsylvania, to ban slavery in any territory gained from Mexico in the Mexican-American War. It passed the House but failed in the Senate, and later attempts to attach it to peace negotiations also failed.

Why it matters

Although it never became law, the proviso exposed the deep split between North and South over whether slavery would expand into new western lands. This fight over slavery in the territories shaped the political battles Zachary Taylor faced as president, leading toward the Compromise of 1850 and, eventually, the Civil War.

Look closer

  • Why might a request for war funding become the occasion for a fight over slavery?
  • What does the map's division of states and territories tell you about the nation's divisions in 1846?
  • Why did the proviso pass the House but fail in the Senate?

This document is part of the curated material that grounds the AI version of Zachary Taylor and James K. Polk on Humy.ai — when students ask about related events, the AI can quote it and cite it.

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Zachary Taylor half plate daguerreotype

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