Migration of Bantu-speaking people initiated a process of assimilation by these people of the previous communities (more oriented to hunter-gathering) due to their knowledge of ironworking, and their extensive use of cattle. And additionally, this was combined with the discovery of large mineral deposits (gold, but also copper and iron) that would be used for the monetization of the trade routes. This would be the beginning of entities such as the Monomotapa kingdom in South Africa and the Songhai, Ghana and Mali empires.
Japan because Archipelago is something to do with Island and South Korea, Taiwan and China are one peace of land I'm sorry if this doesn't make since I'm really bad at explaining.
