That's about how I'd date it although I think it really began when Truman fired MacArthur for wanting to push across the Yalu into China and attack the real enemy during the Korean war. Failure to decisively win that war really altered the balance of power in China's favor.
True enough...but if we go back that far, then we should probably include Patton's desire to immediately attack the Russians...tho, by treaty, they were "defined" as an ally.
MacArthur made one huge mistake and got many of our folks killed because of his ego. I can't share the facts with you right now because I'm going to bed soon. But there was a good/interesting article here on FR about a week ago about this. Maybe someone saved it and can share.
Also, seeing that MacArthur had such an ego, Truman didn't want to see him run for president.
Unfortunately, idiot Eisenhower became president. It was 8 years of vacuum. Like Obama, he also played golf nearly every day.