Replying to NEED HELP WITH AP US HISTORY

I have this one question I'm kind of stuck on and none of my friends get it or they are deciding to not be helpful so i am using my last resort and coming to ns for help with homework.

The question goes:
Assess the moral arguments and political actions of those opposed to the spread of slavery in the contest of the following: the Missouri Compromise, the Mexican War, the Compromise of 1850, and the Kansas-Nebraska Act.

Any help would be appreciated.


THANKS!