Why did societies in north america interact with each other?

The term "social contract" refers to the idea that the state exists only to serve the will of the people, who are the source of all political power enjoyed by the state. The people can choose to give or withhold this power. The idea of the social contract is one of the foundations of the American political system.

answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.