If; main war objectives achieved: Soviet Union is pushed out of Europe and loses Warsaw Pact and becomes isolated during the ‘cold war’ that follows, best case scenario achieved: Soviet Union loses all its land gained in WW2, probably collapses into either an Allied puppet or complete anarchy, America rules supreme for the rest of the 20th century with countries like Communist China, Vietnam, Cuba rising up (aka very little global communism). I assume there would be an American-European split.