Tribe
Classification

Considerable debate has accompanied efforts to define and characterize tribes. In the popular imagination, tribes reflect a primordial social structure from which all subsequent civilizations and states developed. Anthropologist Elman Service presented a system of classification for societies in all human cultures, based on the evolution of social inequality and the role of the state. This system of classification contains four categories:

Tribes are therefore considered to be a political unit formed from an organisation of families (including clans and lineages) based on social or ideological solidarity. Membership of a tribe may be understood as being based on factors such as kinship ("clan"), ethnicity ("race"), language, dwelling place, political group, religious beliefs, oral tradition and/or cultural practices.

Archaeologists continue to explore the development of pre-state tribes. Current research suggests that tribal structures constituted one type of adaptation to situations providing plentiful yet unpredictable resources. Such structures proved flexible enough to coordinate production and distribution of food in times of scarcity, without limiting or constraining people during times of surplus. Anthropologist Morton Fried argued in 1967 that bands organized into tribes in order to resist the violence and exploitation of early kingdoms and states. He wrote:

In fact, there is no absolute necessity for a tribal stage as defined by Sahlins and Service, no necessity, that is, for such a stage to appear in the transit from a single settlement with embedded political organization, to a complex-state structured polity. Such a developmental process could have gone on within a unit that we may conceptualize as a city-state, such a unit as Jericho might have become in its later stages … tribalism can be viewed as reaction to the formation of complex political structure rather than a necessary preliminary stage in its evolution.
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