I firmly believe that FDR made the “Cold War” and the Warsaw Pact and the death of millions by running for the 4th term. The reason was EGO, he felt that he was the “Essential Man” and by running he made Harry Truman his fall guy VP. His run in 1940 was almost as bad but 1944 was an absolute and avoidable DISASTER!
Churchill is the person most responsible for the stuff you mention. And FDR for letting Churchill dwindle him.