Read the journals of David Livingstone, Henry Stanley, Meriwether Lewis, William Clark, Olaudah Equiano, Quobna Ottobah, Ignatius Sancho.... You will learn more about slavery and what the world was like a few hundred years ago from these journals than from second hand historical accounts. Slavery has no color or nation. From early times, small tribes beat up their neighbors. The tribes stole their neighbors' women and sheep and killed their men and boys-- or sold them. Everyone did it. Tribes attacked their enemies and sold them, which was more profitable than killing them. Everyone was guilty. People lived in a world where they were starving; they ate cakes made of mashed bugs. The rules were different, and destitute Africans sold other Africans in a huge slave market, which was run by Arabs and Portuguese for hundreds of years. These Portuguese and Arabian sultans were rich from the ivory trade. The Africans made money selling ivory, and slaves to carry the ivory. The slaves, if they survived hauling the heavy ivory through central Africa, were sold to the ivory buyers, which were the Arabs and Portuguese. They then made a profit selling the ivory and the people who hauled it. There was only one way to enter the interior of Africa and carry ivory; no pack animal could do it-- they all died. Only Africans, walking, could do the job. Native Americans stole people from neighboring tribes as well. This shame has no color; all people of every color and nation have oppressed their neighbors until a greater oppressor comes along and oppresses them. Europe was terrorized by Napoleon; The Sioux terrorized the less powerful tribes in North America; the Zulu did the same in Africa.... Some people act like greedy bullies regardless of where they are and what color they are. Some people are good, some are bad. Their races and nationality don't make a difference. Their reasons are all the same: power and greed.