What effect did the Mexican-American war have on the issue of slavery in the U.S.? Why did it have this effect?

Question

Why would the compromise of 1850 have been controversial in both the north and the south?

Answer 1

http://en.wikipedia.org/wiki/Mexican-American_War#Impact_of_the_War_in_the_United_States

http://en.wikipedia.org/wiki/Compromise_of_1850