Answer:
The Missouri Compromise was an agreement arranged in 1820 between the northern and southern states. It consisted in granting the state of Missouri a slave status in exchange for the consent of the southern states that the western border of slavery would run along the 36° 30' parallel, whereas the border between free and slave states in the East of the continent was drawn along the Mason-Dixon Line and the Ohio River. In addition, a new state - Maine - was separated from Massachusetts to maintain a balance of power in the Senate between slave states and non-slavery states.