OK, for the Nazi and Japanese part, you are right (for the most part but I'd like to add that both Japanese and Nazis were in need of resources and unhappy with their situations, causing them to instigate war), but for the Soviets, they felt their economic decline and were frustrated seeing America grow and develop while they were doing everything they can just to hold themselves together. Towards the end, the Soviets were very nasty and aggressive while the US was very reserved because for America, the goal was to sit it out and wait for the victory without accidentally triggering a nuclear war that would foul everything up to say the least. That draws a lot of parallels to today, made even more painfully obvious to the Americans by COVID. They are desperate to reverse the trend of China growing and developing faster than the US and know that if they just waited it out, it would be defeat for them.
In words, America is getting nastier and more aggressive, like the Soviets, but in action, they have stayed away from military confrontation with the Chinese, just like the Soviets did with America, and very much opposite to what Japan and Germany did when they behaved aggressively due to perceived weakness on the opposing side.