Theory i believe? hope this helps
The Missouri Compromise was primarily aimed at resolving the issue of admitting a slave or free state and which to divide them among after a piece of land was acquired . So the issue was controversy upon admitting slave states or free states into new territories . <span />
Reason , independence , natural environments
One of the main advantages of incumbency for a democratic election is that the people are used to the incumbent, another would be that the incumbent usually has more money, and other would be that they are used to campaigning.
