In the mid 1940s, the US had a very intuitive sense of suffering which lingered from the southerners after the Civil War and reinforced by the Great Depression and their endurance through WWII. Victory doesn't imply defeat, except for the whorehouse operator in Joseph Heller's Catch-22.
Multiply any American capacity for suffering by 10 or more and get back to me. And for Russians it did not start with the USSR being formed.