A
the kinetic theory which explains the physical properties of matter in terms of the motions of its constituent particles.
I'd say Yes, but no at the same time. Because the Islamic's wanted to expand onto Christian Territory so there was always a tension, with the crusades and all. For The Holy Land!
Europe, Africa, and Asia because the Middle East is not a continent.
Slavery still affects our nation today because people are wanting apologies for things our ancestors did. It also still affects our nation because of the black market when people are still selling people for slaves.