Missouri's Compromise was needed because they couldn't buy Missouri by itself because the count was at 11 free states and 11 state slaves so if Missouri was bought it needed to join as either a slave state or as a free state and it would upset the balance of the free to slave states to have equal say. So when Maine requested to join as a free state they saw it as a chance and that's when the Missouri Compromise came in place and there was then 12 to 12 slave to free states at the time so it didn't upset the balance. Thomas Jefferson felt that it was unconstitutional and was violating the Fifth Amendment that guaranteed citizens of "life, liberty, and property" and slaves were property. The Dred Scott decision was a decision made by the
