When given the option, Americans were always going to side with Britain over Germany, especially Nazi Germany.
And don't forget that America was dead-set on staying out of the war until the issue was foisted upon them with Pearl Harbor. Hitler declared war on the US, not the other way around.
Nazism is such an alien, hateful, vicious ideology it's instinctively repulsive to anyone formed in the Christian and Greco-Roman philosophical traditions that underlie Western civilization. Let alone the Anglo-Saxon and later English common law and representative government tradition that had already existed for a millennium.
In addition to this, Nazism was a parochially German ideology. It was a product of its time and place, within the cultural context of a defeated and desperate Germany. Which is why dipshits like the NJP are delusional if they think Nazism would ever organically catch on in the United States.
To the surprise of nobody who isn't a psychopath, when you start barging into other people's countries and declaring them your inferiors at gunpoint, you tend to become disliked.
It's why Nazism rose to power in the first place; the Treaty of Versailles kicked Germany while she was down, and the poverty and degeneracy imposed on her fueled resentment.
True, violence may be the Final Argument of Kings, but that's only a short-term solution that you pull out in the most dire of circumstances. You have to give the conquered a better reason than "you lost, sucks to suck" to accept your authority, like the League of Nations did.
Germans voted for Hitler because they were rightfully afraid of bloodthirsty Judeo-Bolsheviks. So once the Nazis were defeated, the US assuaged their fears by promising to protect those in their regions of control from the Commies, in exchange for trade and rebuilding via the Marshall Plan. Same with Japan, South Korea, Western Europe, et al. Hence, the postwar world order was born.
Bottom line: cruelty and arrogance can only get you so far. It makes people hate you. Hitler might not have become the Dark Lord of modern creation myth if he had just stayed in his lane, not sperged out about racial purity, and focused on rebuilding Germany.
He could have been like Francisco Franco, who stomped out Commies and wisely avoided confrontation with the Western democracies, which led him to rule until 1975.
Maybe then, nationalism wouldn't be a bad word.