Balanced reciprocity is as much a social compact as it is an economic advantage. It is particularly important in hunting-gathering societies, where n… - Peter Farb

At the time of the Europeans discovery of North America, the American Indians already cultivated a wider variety of plants than did the Europeans.

Why did not Indians enter White society, particularly in view of the numerous attempts by Whites to "civilize" them? The answer is that White settlers possessed no traditions and institutions comparable to the Indians' hospitality and sharing, adoption, and complete social integration. ...Whites who educated Indians did so with the idea that the Indians would return to their own people as missionaries to spread the gospel, not that they might become functioning parts of White society.

For a tribe to endure, it must find some way to achieve internal unity—and that way usually is external strife. The tribe exists at all times in a state of mobilization for war against its neighbors. The slightest incident, or often merely a desire to increase prestige, is enough to set off a skirmish, and in such circumstances hatred against external enemies must be unremitting.