There are a number of different theories and hypotheses regarding early state formation that seek generalizations to explain why the state developed in some places but not others. Other scholars believe that generalizations are unhelpful and that each case of early state formation should be treated on its own.[32]

Voluntary theories contend that diverse groups of people came together to form states as a result of some shared rational interest.[33] The theories largely focus on the development of agriculture, and the population and organizational pressure that followed and resulted in state formation. One of the most prominent theories of early and primary state formation is the hydraulic hypothesis, which contends that the state was a result of the need to build and maintain large-scale irrigation projects.[34]

Conflict theories of state formation regard conflict and dominance of some population over another population as key to the formation of states.[33] In contrast with voluntary theories, these arguments believe that people do not voluntarily agree to create a state to maximize benefits, but that states form due to some form of oppression by one group over others. Some theories in turn argue that warfare was critical for state formation.