The two houses disagreed on the question of the legality of slavery, but also on the parliamentary question of the inclusion of Maine and Missouri in the same bill. The commission recommended the passage of two laws, one for maine admission and the other an enabling law for Missouri. He also recommended that there be no restrictions on slavery, but that the Thomas Amendment should be maintained. Both houses agreed, and the measures were adopted on March 5, 1820 and signed on March 6 by President James Monroe. When Congress met again in December 1819, it was faced with a request from the state of Maine. At the time, there were 22 states, half of which were free states and half were slave states. The Senate passed a bill authorizing Maine to join the Union as a free state and Missouri without restrictions on slavery. Sen. Jesse B. Thomas of Illinois added an amendment that allowed Missouri to become a slave state, but prohibited slavery in the rest of Louisiana Purchase north of 36-30`. Henry Clay then skilfully led the forces of compromise and led separate votes on the controversial measures.
On March 27, 1820, the decisive votes of the Maine House of Representatives as the Free State of Missouri were considered a slave state and made free ground in all western territories north of the southern Missouri border. The Missouri Compromise was a U.S. federal law that brought Maine into the United States as a free state, along with Missouri as a slave state, which maintained the balance of power between North and South in the U.S. Senate. As part of the compromise, the law prohibits slavery north of the 36-30″ parallel, except for Missouri. The 16th Congress of the United States passed the law on March 3, 1820, and President James Monroe signed it on March 6, 1820.  The following summer, considerable public opinion was gathered in the north in support of Tallmadge`s proposal. Much of this anti-Missouri atmosphere, as it was called, was born out of the true belief that slavery was morally false. Political opportunity has been mixed with moral convictions.
Many prominent anti-Missouri men had been active in the federalist party, which appeared to be in the process of disintegration; she was accused of looking for a problem to rebuild her party. Federalist leaders of the anti-Missouri group have pushed some northern Democrats to reconsider their support for the Tallmadge amendment and to support a compromise that would undermine the federalist party`s stimulus efforts. When Maine proposed its state application, the Senate quickly associated the Maine and Missouri bills, making Maine`s membership a precondition for Missouri`s membership in the Union as a slave state. Senator Jesse B. Thomas of Illinois proposed a compromise excluding slavery from all other Louisiana Purchase countries north of 36-30`. The combined measures were passed in the Senate to be rejected in the Northern House of Representatives by representatives of the North who are exposed to a free Missouri. House spokesman Henry Clay of Kentucky, in a desperate attempt to break the deadlock, has divided Senate laws. Clay and his pro-compromise allies managed to put half of the anti-restrictiist House Southerner under pressure to submit to the passage of Thomas`s sub-command, and maneuvered a series of restraining House Northerners to support Missouri as a slave state.   The Missouri issue in the 15th Congress ended on March 4, 1819, at a dead end, when the House of Representatives maintained its anti-slavery position in the North and the Senate blocked a slavery that restricted the state.