This document discusses the diversity of African societies and kingdoms throughout history. It describes stateless and state-based societies in Africa and how Islam arrived in North Africa. It then discusses the powerful kingdoms that arose in West Africa, including Mali and Songhai along the Niger River valley. It also summarizes the coastal trading kingdoms along East Africa's Swahili coast that blended Bantu, Islamic, and Southeast Asian cultures. Finally, it mentions some of the influential forest and plains kingdoms like Yoruba, Benin, Luba, Kongo, and the Mwene Mutapa kingdom in Zimbabwe.