What factors do you think determine whether or not the united states intervened militarily in other nations?

The United States mediated when fundamental United States interests and resources American lives, majority rule government, oil were in question. 
The elements caused the finish of the Cold War: 
occasions in the Soviet Union 
occasions in Germany and Eastern Europe 
how U.S. pioneers reacted to those occasions

It didn't cause alarm it cause caous because all the military people were running so much people were afraid that something dangerous was going on