maddy faulkner and jake spencer
The Confederacy did not want to abolish slavery. In fact, they wanted to expand slavery into the new territories of the US.
Slavery was abolished in the United States territories in June 1862. Any new territory was not to have possession of any slaves after this date.
It prohibited slavery North of a certain parallel, but only in the territories brought in under the Louisiana Purchase. When the new Mexican territories came in, they needed a new compromise. That one did not hold.
Too allow slavery in new territories
To end an argument about slavery in the territories (apex)
The intent of the Wilmot Proviso was to not allow slavery in the new US territories. In 1846, US President Polk asked Congress to appropriate $2 million for expenses related to the war against Mexico. Congressman David Wilmot attached an amendment to this appropriations bill. Wilmot was a fellow party member of President Polk.
Slavery
Both the Missouri compromises gave the US more time to consider the issue of slavery and whether slavery would be allowed in the new US territories. There is no direct linkage to the last Missouri compromise of 1850 and the US Civil War.
In 1820, politicians debated the question of whether slavery would be legal in the western territories. The Missouri Compromise permitted slavery in the new state of Missouri and the Arkansas Territory but it was barred everywhere west and north of Missouri.
Generally speaking, Northerners and Northern politicians believed that slavery should not be allowed to expand to new territories or new states. Part of their argument was negated in 1857 by a ruling by the US Supreme Court which said slavery was constitutional.
The Compromise of 1850 changed the basis for slavery in the US. Under the Missouri Compromise (1820), new territories and states would allow slavery if they were located below 36° 30' N latitude. At the time, this was mostly Mexican territory, but much of it was ceded to the US following the Mexican-American War (1846-1848) and abolitionists did not want slavery extended to the area. The Compromise of 1850 left the issue of slavery up to the inhabitants of those new territories, i.e. popular sovereignty.
Southern slave states saw that the new western US territories might not be slave states. If so, then in the US Congress, they would soon be under represented. Without new territories to be settled, then the South had a chance to remain in equal parity in the US Congress.