Why did the tribal society feel that they need leadership ?

Tribal leaders at the level work to build and develop triadic relationships by two people who do not know each other together based on shared values. In case a conflict arises, the leader of the tribe would encourage the parties involved to resolve the conflict by themselves.

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both the house and senate must approve the conference report.   after it is approved by both on an identical from, it will be sent to the president.   if the president approves it, it will become law.