Answer:
C. they could own slaves
Explanation:
Mexico's rule of Texas abolished slavery and therefore African-Americans could not own slaves.
State Representation is based off the population of the state, since slaves weren't technically citizens, they were not counted in deciding how many representatives a state had. Slaves were a large majority of the population in the south. The south thought they were under represented and wanted slaves to be counted so representation was fair in their eyes.
Harry S Truman The Buck Stops Here means I'm the ultimately responsible person in this organization. Other people can pass the buck to me, but I can't pass the buck to anyone else.