How and why did the united states take a more active role in world affairs

The United States took a larger role in world affairs through the projection of its military and economic power. It did so in order to become a more important country. By the late 1800s, the United States was big enough and strong enough to want to play a greater role in international affairs.

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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.

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