Explain the cultural and economic interactions between the american indians and europeans.

the columbian exchange.

Explanation:

The indigenous people had all sorts of new fruits, vegetables, and animals.  The europeans had animals that were not known by native people.  Things like peanuts, turkeys, pineapples, cacao beans, and vanilla were traded for european goods such as wheat, cows, pigs, sheep, horses, barley, bananas, etc.  Although, natives got unfamiliar diseases brought by sailors.

answer: an oligarchy is a political system in which the government is run by a group of noble families, or the elite wealthy members of a society. a present day oligarchic government is iran.

explanation:

these civilizations were located around fertile rivers, where they could produce an abundance of crops