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One common social structure among ethnic groups in sub-Saharan Africa is segmentary lineage organisation. Segmentary lineage societies are characterised by the foremost importance of kin relationships in determining individuals’ social and political allegiances, as well as their patterns of residence.1 Several anthropologists have posited a direct link between segmentary lineage organisation and violent conflict (especially Evans-Pritchard 1940 and Sahlins 1961, but also Bohannon 1958, Kelly 1985, Lewis 1961, 1989, 1994, Salzman 2007). In particular, they argue that clearly defined allegiances based on genealogy make segmentary lineage societies well designed to mobilise combatants for conflict. To our knowledge, however, this relationship has never been studied systematically or empirically.
Consider the diagram in Figure 1 of a hypothetical (patrilineal) segmentary lineage society. Triangles represent men and each row represents a generation. All individuals descend from a common ancestor ‘I’ and are also members of smaller lineage segments with other individuals who are increasingly closely related to them. In Figure 1, if individual ‘i’ were to have a dispute with individual ‘ix,’ all individuals belonging to ‘Major Segment A’ would be allied with, and come to the defence of, individual ‘i.’ Similarly, all individuals in ‘Major Segment B’ would be allied with and come to the defence of individual ‘ix.’ Thus, a dispute between two individuals escalates into a dispute between two large communities, as individuals mobilise to support members of their lineage or lineage segment.
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