In the world of anthropology we call this segmentary opposition. “Me against my brother, both of us against our father, all of us against you.”
The exemplar description is invariably Evans-Pritchard’s description of how Nuer lineages fight one another, come together as a clan to fight other clans, and how all Nuer clans come together to fight the Dinka. It has been suggested, though, that many of forms of social organization he described amongst the Nuer are modeled upon the social life of the Bedouins in Libya with whom he served during WWII.
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