What are the reasons for the appearance of tribes? How was tribal governance organized?

The communities grew up to several hundred people, and then they were divided. The earth could not feed everyone, and it was necessary to look for a new place. As a result, tribes were formed.
The tribe was headed by a council of elders. The elders discussed issues of economic life, resolved disputes between people, determined punishments. The most important issues were resolved at a joint meeting of adult tribesmen.

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