The Bantu migration in Africa pushed out native peoples called the _______ to other areas. The _______ is the geographic feature that separates northern Africa from southern Africa. The wealth of the empire of Ghana was based on _______. The _______ reunited China after centuries of disruption after the fall of the Han Dynasty. Oceania is divided into Micronesia, _______, and Polynesia. _______ was the only female empress in China's history. Respond to the following based on your reading. How did the Sui Dynasty help prepare for the cultural heights of the Tang Dynasty? What are the differences among the three geographic areas of Oceania?