Much speculation has been devoted to the possible connexions between the different clusters of kingdoms in Africa. Scholars have been puzzled for over half a century by the similarities in organization and ideology between different African states. They have tried to explain them either as the product of the diffusion of a common pattern, the ‘Sudanic State’ or the ‘Sacral Kingship’, or by maintaining that similar functional needs led to parallel independent inventions in many different areas. In Central Africa the specific positions taken have been that the Katanga states diffused their model of government to the Lower Congo cluster, or, as I myself have claimed, that these were independent. Dittmer links the Lower Congo with Katanga, and derives the latter cluster itself from the interlacustrine and Ethiopian clusters
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