What did the north gain from the Missouri compromise?

Maine was taken in as a free state. All states north of 36 30 were free states as the Senate wanted to keep a balance between slave and free states in the legislative branch.

First, Missouri would be admitted to the union as a slave state, but would be balanced by the admission of Maine, a free state, that had long wanted to be separated from Massachusetts. Second, slavery was to be excluded from all new states in the Louisiana Purchase north of the southern boundary of Missouri.

Explanation:

It was in google. o_o