Which statement provides supporting evidence for why the compromise of 1850 between the north and south failed? a. the compromise did not allow the people living in the new western states to decide whether their states would ban slavery. b. southern politicians opposed the compromise because it banned slavery in all of the new western states. c. the compromise banned the slave trade in washington, dc, and allowed california to join the nation as a free state. d. northeners became strong opponents of the strengthened fugitive slave act, which was part of the compromise.