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Wikipedia - Early History of Angola
Khoisan hunter-gatherers are the earliest known modern human inhabitants of the area. They were largely absorbed and/or replaced by Bantu peoples during the Bantu migrations, though small numbers remain in parts of southern Angola to the present day. The Bantu came from the north, probably from somewhere near the present-day Republic of Cameroon. When they reached what is now Angola, they encountered the Khoisan, Bushmen and other groups considerably less technologically advanced than themselves, whom they easily dominated with their superior knowledge of metal-working, ceramics and agriculture. The establishment of the Bantu took many centuries and gave rise to various groups who took on different ethnic characteristics.
During this period of time, the Bantu established a number of political units ("kingdoms", "empires") in most parts of what today is Angola. The best known of these is the Kingdom of the Kongo that had its centre in the northwest of contemporary Angola, but included important regions in the west of present day Democratic Republic of the Congo and Republic of Congo as well as in southern Gabon. It established trade routes with other trading cities and civilizations up and down the coast of southwestern and West Africa and even with the Great Zimbabwe Mutapa Empire, but engaged in little or no transoceanic trade.