This taxation system, an ancient relic dug out from the trash heap, is a brand new version that the natives of Sub-Saharan Africa have never seen before.
Of course, only the newly occupied territories adopt this, regions like Zambia and the Azande plateau, which are adjacent to East Africa, still adhere to the old systems. Especially during the European wars, East Africa can afford to implement such systems due to its affluent immigrant population.
The Zambian government institutions have been established, and each area is managed by a governor, without any need to compromise with native powers. The Azande Plateau came a bit later, as East Africa was not actively developing it. However, since it's close to the Great Lakes Region, it's easy to control. Moreover, with a large number of natives previously cleared out, there's no need to invest much effort.
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Soron Lake (Tanganyika Lake).