Why might the american revolution in south be considered a civil war?

It probably would have been considered a civil war early on because the british colonies had been under the same rule until they declared independance. as soon as that happened it became a war between two, no longer one, nations.

The compromises the congress did to settle the Missouri crisis were the exclusion of slavery from most of the Louisiana Purchase and in return, Missouri becomes a slave state.

Explanation:

The Missouri Compromise of 1820 which was majorly composed by Henry Clay was popular for admitting Missouri into the Union as a slave state.

However, the compromises over slavery that Congress make to settle the Missouri crisis was the "exclusion of slavery from most of the Louisiana Purchase and in return, Missouri becomes a slave state."

Also, this made the state of Maine to enter the union as a free state.

It was also known to level the proportion in the senate between north and south.

Similarly, it set the standards for subsequent admission of states into the United States.