Who became rivals even though they both were communists?

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

Ireally have to get this done today and i'd appreciate any i could get, !

In the 1950s, the u.s. government encouraged american jazz musicians to perform in the soviet union, which was an enemy of the u.s. at the time. of what foreign policy goal is this a good example? strengthening world economic growth improving education for the global population advancing the growth of democracy and good government increasing understanding of american values and creating a receptive international environment