March 3, 1820

The Missouri Compromise was passed by the U.S. Congress.


Washington D.C., United States | United States Congress

Watercolor painting based depiction of The Missouri Compromise was passed by the U.S. Congress. (1820)

The Missouri Compromise of March 3, 1820

The Missouri Compromise was a significant legislative agreement passed by the United States Congress on March 3, 1820. It was an effort to maintain the balance of power between free and slave states following the request for Missouri’s admission to the Union as a slave state, which threatened to disrupt the equal representation in the Senate.

Context and Background

In the early 19th century, the United States faced increasing tension over the issue of slavery, particularly in territories and states that were part of the westward expansion. By 1819, there was an even split in the Senate, with 11 free states and 11 slave states. The admission of any new state threatened to tip this delicate balance toward one side.

Missouri’s request to join the Union as a slave state in 1819 set off intense debates. Northern politicians were particularly opposed to this because it would expand the institution of slavery and give the slave states greater power in Congress.

Key Provisions of the Missouri Compromise

  1. Admission of Missouri and Maine: The compromise allowed Missouri to enter the Union as a slave state, while simultaneously admitting Maine as a free state, thus preserving the balance between free and slave-holding states.

  2. 36°30’ Parallel: One of the most significant elements of the compromise was the establishment of the 36°30’ parallel as the division line north of which slavery was prohibited in the remaining territories of the Louisiana Purchase, except for Missouri.

  3. Compromise Legislation: The Missouri Compromise manifested in three separate bills which together formed a unified agreement passed by Congress.

Impact and Aftermath

  • Temporary Solution: The Missouri Compromise provided a temporary resolution to sectional conflict and allowed for the continued union of the states, averting a potential crisis at that time.

  • Political Precedent: It set an important precedent for how Congress would handle future admissions of states and the contentious issue of slavery’s expansion in the western territories.

  • Repeal and Legacy: The compromise was effectively repealed by the Kansas-Nebraska Act of 1854, which established the concept of popular sovereignty, allowing territories to decide for themselves whether to permit slavery. This led to increased tensions and conflict, notably “Bleeding Kansas,” and set the stage for subsequent national crises culminating in the Civil War.

The Missouri Compromise is remembered as a pivotal event in American history that highlighted the deep divisions over slavery and set the stage for future conflicts leading to the Civil War. Its eventual dissolution underscored the challenges of balancing states’ rights and federal authority, and its legacy is a testament to the complexity of the Union’s struggles with slavery.