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Missouri Compromise Overview

Aug 25, 2025

Overview

This lecture explains the Missouri Compromise of 1820, its provisions, and its significant role in the escalating national debate over slavery in the United States.

Historical Context

  • In 1820, the US had 22 states: 11 free and 11 slave states.
  • Missouri, from the Louisiana Purchase, wanted to join as a slave state, threatening the balance.
  • Slavery was a deeply divisive national issue, fueling conflicts between regions and political ideologies.

The Debate Over Slavery

  • Northerners argued that Congress should be able to prohibit slavery in new states.
  • Southerners supported popular sovereignty, allowing states to decide on slavery themselves.
  • The core issue was maintaining equal political power between free and slave states.

The Missouri Compromise

  • Missouri was admitted as a slave state, and Maine was admitted as a free state to keep balance.
  • The compromise banned slavery in Louisiana Purchase lands north of latitude 36°30', except Missouri.
  • The agreement maintained the status quo but did not address or abolish existing slavery.

Lasting Impact

  • The Compromise temporarily eased tensions but failed to resolve the deeper conflict over slavery.
  • The debate over slavery and congressional power continued, contributing to the eventual Civil War.

Key Terms & Definitions

  • Missouri Compromise — An 1820 agreement admitting Missouri as a slave state and Maine as a free state, while banning slavery north of 36°30'.
  • Popular Sovereignty — The idea that states should vote to decide if they permit slavery.
  • Louisiana Purchase — Territory acquired by the US from France in 1803, including Missouri.
  • Status Quo — Maintaining the existing state of affairs, especially regarding slavery.

Action Items / Next Steps

  • Review readings on the Missouri Compromise and its role in pre-Civil War tensions.
  • Prepare to discuss how compromises can delay but not resolve major national conflicts.