Strategically, why didn't we find a way to accommodate Japan's real needs to expand its base territory and economy in response to the Depression and a population that was uncontrolled by birth control? Why would educated Germans buy into a need to believe in racial superiority giving them a right to conquer and rule other societies?
So who's land should we have stolen and then give to Japan? China was more than large enough for Japan, they were just intent on accumulating an empire filled with 'inferior' slaves, and such imperialism is never satisfied.
As for Germany, the whole 'Aryan Uber Man' thing started in the 1870's, with a newly unified Germany and an Emperor who wanted to build a common ethnic national identity built around 'German race and culture', not so very different than what France and England and other European countries already had had for centuries. Even Max Weber was a member of one of the early groups promoting that.
Well, the Japanese did end up commercially dominating the far east up until the 1990s or so. Is there some surprise the European colonialists were dislike, or that Vietnman was a misadventure.
And yes, WWII was in many ways a continuation of WWI, and a failure of TR and Wilson.
And family planning was known before 1941, but not routinely practiced.
But, my question was whether the thread was about strategic interests, as John Toland and Barbara Tuchmann wrote about. Or whether Patton could have reached Berlin in the Winter of 44.
If its about stuff like that, I'd say our biggest failure was not mounting the cross channel invasion in 1943.