The Missouri admission debate also raised the issue of sectoral balance, with the country divided equally between slave states and free states, eleven each. Admitting Missouri as a slave state would reverse the balance of the Senate, consisting of two senators per state, to the benefit of the slave states. That is what has made the northern states that they have Maine as a free state. Maine was admitted in 1820, and Missouri in 1821, but until 1836, when Arkansas was admitted, no other states were added.  Prior to the purchase in 1803, the Spanish and French governments had sanctioned slavery in the region. In 1812, Louisiana, a major cotton producer and the first to be carved from the Louisiana Purchase, joined the Union as a slave state. Not surprisingly, Missourians insisted that slavery should not be harassed by the federal government.  In the years following the War of 1812, the area, now known as Missouri Territory, experienced rapid colonization by slavers.  As a legal precedent, they offered the Louisiana Land Acquisition Treaty in 1803 a document containing a provision, Article 3, that extends the rights of U.S. citizens to all residents of the new territory, including the protection of slave property.  When Jefferson`s slavers accepted constitutional restrictions for limited central government, they were reminded that in 1803, as president, Jefferson had departed from those rules by exercising the federal executive to double the size of the United States, including the countries considered for the state of Missouri.
He thus set a constitutional precedent that would serve to rationalize the restrictions imposed by the Confederacy on the enslavement of Tallmadges.  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. The clashes included competition between the southern and northern states for power in Congress and control of future territories. The same factions also emerged when the Republican Democratic Party began to lose its coherence.
In an April 22 letter to John Holmes, Thomas Jefferson wrote that the division of the country created by the line of compromise would ultimately lead to the destruction of the Union: When it met again in December 1819, Congress 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 Dred Scott v.
Sandford The 1857 Supreme Court decision found that the Missouri compromise was unconstitutional.