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In page Government:
The development of agriculture and water control projects were a catalyst for the development of governments. For many thousands of years when people were hunter-gatherers and small scale farmers, humans lived in small, non-hierarchical and self-sufficient communities. 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, and that allowed for ever increasing population densities. David Christian explains how this resulted in states with laws and governments:
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