According to the "origins of the state" when states form over time from family units to extended kinship groups this is referred as the theory.

Evolution Theory

Explanation:

There are several theories on the origins of the state, most people divide four ways of origin of state: force theory, evolutionary theory, divine right theory, and social contract theory. The Theory that describes a state that is formed over time, from family units to extended kinship groups is the evolution theory.

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