The Missouri Compromise was an agreement passed in 1820 between the pro-slavery and anti-slavery factions in the United States Congress, involving primarily the regulation of slavery in the western territories. It prohibited slavery in the former Louisiana Territory north of the parallel 36°30' north except within the boundaries of the proposed state of Missouri. Prior to the agreement, the House of Representatives had refused to accept this compromise and a conference committee was appointed.
A bill to enable the people of the Missouri Territory to draft a constitution and form a government preliminary to admission into the Union came before the House of Representatives in Committee of the Whole, on February 13, 1819. An amendment offered by James Tallmadge of New York (which was named the Tallmadge Amendment), which provided that the further introduction of slaves into Missouri should be forbidden, and that all children of slave parents born in the state after its admission should be free at the age of 25, was adopted by the committee and incorporated in the bill as finally passed on February 17, 1819 by the house. The United States Senate refused to concur in the amendment, and the whole measure was lost.
During the following session (1819-1820), the House passed a similar bill with an amendment, introduced on January 26, 1820 by John W. Taylor of New York, allowing Missouri into the union as a slave state. The question had been complicated by the admission in December of Alabama, a slave state, making the number of slave and free states equal. In addition, there was a bill in passage through the House (January 3, 1820) to admit Maine as a free state.
The Senate decided to connect the two measures. It passed a bill for the admission of Maine with an amendment enabling the people of Missouri to form a state constitution. Before the bill was returned to the House, a second amendment was adopted on the motion of Jesse B. Thomas of Illinois, excluding slavery from the Missouri Territory north of the parallel 36°30' north (the southern boundary of Missouri), except within the limits of the proposed state of Missouri.
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The Missouri compromise was a compromise of 1820 that stated that prohibited slavery former louisianna territory north of the parallel 36, 30 north.
When Missouri entered the union as a slave state and Maine entered as a free state then everything above Missouri's top border line was a free state and everything below was a state.
The parallel of Missouri's Southern border was the official reference-point for the new Western territories when they became states of the union. Anywhere north of that line - all the way to the Pacific - slavery was illegal.
In 1820 the tension was high as the union decided weather or not they should admitt new state in. The states were disagreeing about the slavery or antislavery environment would be in Missiouri if it was admitted into the union. While Congress considered the Missiouri question Maine applied for statehood broadening the discussion to Maine and Missiouri. Henry clay stepped in and made a comprimise to keep the balance between the north and south. In March 1820 the Missiouri Comprimise was reached, admitting Missiouri as a slave state and Maine as a free state. The remainder of the Louisiana Teriotory north of the 36degree 30'N parallel banned slavery.
tallmadge amendment
They made the Missouri Compromise and the Compromise of 1850.
Compromise of 1787 (the Great Compromise)