How did Europeans change slavery?

Africans were either captured in warring raids or kidnapped and taken to the port by African slave traders. There they were exchanged for iron, guns, gunpowder, mirrors, knives, cloth, and beads brought by boat from Europe. When Europeans arrived along the West African coast, slavery already existed on the continent.

i believe your answer is mountains.

answer; protectionism fosters competition and keeps price regulated;