Why did the United States work so hard to build up its
military during the Cold War?

A) To prevent communism from spreading to their land

B) They were at war with lots of countries

The quote below is an excerpt from the charter of the united nations: "the purposes of the united nations are: to maintain international peace and security, and to that end: to take effective collective measures for the prevention and removal of threats to the peace, and for the suppression of acts of aggression or other breaches of the peace, and to bring about by peaceful means, and in conformity with the principles of justice and international law, adjustment or settlement of international disputes or situations which might lead to a breach of the peace . " source:this section implies that the united nations is prepared to do what to keep world peace?

What new concept did the the american revolution introduce into the world

How long have counties been a part of the government structure of the united states?