Answer:
Made it worse.
Step-by-step explanation:
I'm going to use the word polarized, because it deepened their antagonism each state felt towards the other.
It could not help but do so. Slavery was a very touchy issue. You either needed it, or you needed to see it abolished. There really was no place to compromise the issue. So it made things much worse and the compromise they did enact only moved the conflict one border away.