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In page Nguni people:

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Within the Nguni nations, the clan, based on male ancestry, formed the highest social unit.[citation needed] Each clan was led by a chieftain.[citation needed] Influential men tried to achieve independence by creating their own clan.[citation needed] The power of a chieftain often depended on how well he could hold his clan together.[citation needed] From about 1800, the rise of the Zulu clan of the Nguni, and the consequent Mfecane that accompanied the expansion of the Zulus under Shaka helped to drive a process of alliance and consolidation among many of the smaller clans.[citation needed]