THE MISSOURI COMPROMISE

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Short summary
- The Missouri Compromise (1820) was a congressional agreement that temporarily resolved a sectional dispute over the expansion of slavery in the western territories after the Louisiana Purchase.
- Its main provisions: admit Missouri as a slave state and admit Maine (formerly part of Massachusetts) as a free state to keep the Senate balance; prohibit slavery in the remainder of the Louisiana Territory north of latitude 36°30′ (the southern boundary of Missouri), except for Missouri itself.

Background and key events
- In 1819 Missouri applied for statehood as a slave state, threatening to upset the 11–11 balance of free and slave states in the Senate.
- Rep. James Tallmadge Jr. proposed an amendment to restrict slavery in Missouri (gradual emancipation), which passed the House but failed in the Senate.
- Henry Clay, dubbed the “Great Compromiser,” helped craft the final agreement that passed Congress in 1820.

Why it mattered
- Short term: It preserved the political balance between North and South and postponed an immediate crisis over slavery.
- Long term: It set a precedent for congressional regulation of slavery in the territories, deepened sectional identities, and proved to be only a temporary fix. The Compromise’s restriction line heightened northern–southern divisions over future territorial expansion.

What came later
- The Missouri Compromise’s restrictions were effectively repealed by the Kansas–Nebraska Act (1854), which allowed popular sovereignty to decide slavery in new territories.
- The U.S. Supreme Court’s Dred Scott decision (1857) declared congressional bans on slavery in the territories unconstitutional, striking a further blow to the Compromise’s framework.
- Historians view the Missouri Compromise as an important but ultimately inadequate measure that postponed — rather than resolved — the conflict that led to the Civil War.

Key figures
- Henry Clay (kept the compromise coalition together)
- James Tallmadge Jr. (proposed the anti-slavery amendment for Missouri)
- Leading sectional voices in Congress on both sides opposed or supported parts of the settlement.

If you’d like, I can:
- Provide the full legislative wording or timeline of votes,
- Explain Tallmadge’s amendment in more detail,
- Compare contemporary Northern and Southern reactions, or
- Show how the Compromise influenced specific later events (Kansas–Nebraska, Dred Scott).