Answer:
Missouri’s bid to become the first state west of the Mississippi River, and to allow slavery within its borders, set off a bitter debate in a Congress that was already divided into pro- and anti-slavery factions. During the debate, Rep. James Tallmadge of New York proposed an amendment to the statehood bill that would have eventually ended slavery in Missouri and set the existing enslaved workers there free. Southerners who opposed the Missouri Compromise did so because it set a precedent for Congress to make laws concerning slavery, while Northerners disliked the law because it meant slavery was expanded into new territory. Sorry I can't list everything this was an essay that I don't have anymore I'm just going off the top of my head.
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