How did territorial expansion increase tensions over slavery in the United States

Even though both ww1 and ww2 were in many ways the same conflict with basically the same countries facing off against each other, the way each war started was significantly different. the question is how what were the differences on how they started

What caused the comanche kiowa raiding? a. gadsden purchase b. battle of alamo c. bear flag revolt d. settlement of texas

Which is true about pontiacs war in 1763