The document summarizes the history of slavery in Africa and the Atlantic slave trade. It describes how slavery existed in Africa prior to European contact, with slaves typically being war captives with no rights. The slave trade expanded dramatically with the arrival of Europeans due to demand for slaves in the Americas. Slaves were captured through raids and wars, transported in inhumane conditions where many died, and then sold at auctions and used as labor on plantations. Over 12 million Africans were ultimately transported through this system, devastating Africa's population and economy.