They are the Greatest Generation not only because they survived the worst depression in world history (which 'toughened them up' in preparation, so to speak), but also faced down Nazi Germany and militarist Japan, and set the stage for eventual victory over the Soviet Union and communism -even if it was decades in the making.
The threats and trials of tribulation we face pale by comparison.
How? The Soviets were put on the slump to eventual stagnation once they adopted Stalinist economics and abandoned the NEP. I don't see how the American WWII generation affected their fall.
I meant by the passage of the Marshall Plan, the creation of NATO, and the overall adoption of containment (along with the nuclear deterrent) as a policy vis-a-vis the Soviet Union.