Missouri Compromise signed

Background. By 1819, Missouri Territory approached the population threshold for statehood, sparking a dispute over slavery restrictions. The 15th Congress ended in stalemate, with the House sustaining anti-slavery positions and the Senate blocking restrictions. The issue devolved to the 16th Congress, where northern representatives held a slim majority despite demographic disparities. Federalists expanded their critique to include moral considerations of slavery during the 1820 debates.

Legislative Process. In January 1820, a bill to admit Maine as a free state was in passage through the House. In February 1820, the Senate passed a bill for Maine's admission with an amendment enabling Missouri to form a state constitution. The 16th Congress passed the legislation on March 3, 1820, while both houses agreed on the measures on March 5, 1820. President James Monroe, who opposed restrictions on slavery, reluctantly signed the Compromise into law on March 6, 1820.

Political Context. Henry Clay helped bring an end to the sectional crisis by leading the passage of the Missouri Compromise in 1820. The legislation balanced desires to prevent slavery expansion with those to expand it. Thomas Jefferson predicted in April 1820 that the line drawn would someday tear the Union apart. The compromise delayed the Civil War but also sowed its seeds.