How could the USA’s westward expansion cause an intense debate over slavery?

Which scenario best illustrates the principle of popular sovereignty?

Which statements explain reasons why unconformities occur? check all that apply. rocks along a fault break and move. igneous rock forms at earth’s surface. rocks erode and sediment is deposited. no sediment is deposited over a long time. igneous rock forms between sedimentary layers.

Brainliesttt !me : ) describe the event : increase in islamic extremis in the middle east