The USSR was always far ahead of the US in terms of population. The gap was largest at at the start of WW2, with almost 200 million on our side against 133 million in America. However, the power balance at the time was obviously not in our favor, to say the least.
In terms of global influence, economy and military might, the USSR reached the zenith much later, by the mid-1970s. In America, this was the era of upheaval and despondence. Not much to boast of in Europe either, the NATO was clearly weakened, too. Our coffers in the meantime were bulging with petrodollars, we were seriously courting the Germans, and many influential Europeans pondered if the “Russians” might be better friends to them than the Americans.