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In page Government:

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The development of agriculture and water control projects were a catalyst for the development of governments.[3] For many thousands of years when people were hunter-gatherers and small scale farmers, humans lived in small, non-hierarchical and self-sufficient communities.[citation needed] On occasion a chief of a tribe was elected by various rituals or tests of strength to govern his tribe, sometimes with a group of elder tribesmen as a council. The human ability to precisely communicate abstract, learned information allowed humans to become ever more effective at agriculture,[4] and that allowed for ever increasing population densities.[1] David Christian explains how this resulted in states with laws and governments:[5]