Why was it important to maintain a balance of free states and slave states?

It kept one side from having to much power in congress

Explanation:

I don't know how to really explain it

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.

the answer is a

explanation: