The Missouri Compromise of 1820, which admitted Missouri as a slave state and Maine as a free state, temporarily solved the divisive issue of slavery’s spread to the western territories. The issue continued, however, to flare up in Congress until the Civil War. In 1850, Senator Henry Clay sought another compromise to preserve the Union and avoid war. The most famous debate in the history of the Senate ensued between Senators John C. Calhoun and Daniel Webster over Clay’s proposals. It was the last debate among these three giants of the Senate.