See, and... I don't see it.
At a base level, Germany was an upstart world power encircled by old cultures wary of the remnants of the Hapsburgs. It stumbled its way into WWI through the arrogance and idiocy of its absolute monarch and ended up engaged in total war on its borders until it became clear that the stalemate was a war of attrition both parties would lose. It was hit with punitive reparations (that, depending on the accounting, were actually money paid by the USA to Germany) in the midst of a global economic collapse that led to out-of-control inflation.
At a base level, the United States has been the undisputed heavyweight champion of the world for nearly 30 years now, and one of two titans standing for sixty. The only war it has ever lost was a foreign misadventure that ended up not mattering to its borders or its trade policies. It is a democratic institution with generally-effective checks and balances that has never so much as paid reparations to the slaves it took or the natives it exterminated and is one of the strongest economies in a world of strong economies. Inflation, meanwhile, has been under 5% for 30 years; lately all the economists are talking about deflation.
At a base level, Adolph Hitler was a populist demagogue who railed against the power structure of the elites based on his brutally wrong understanding of genetics and sociology. He came to notice through an attempt at armed insurrection and grew to fame through championing a policy of mass deportation of the world's oldest scapegoat, the Jews. The Jews, for their part, were more likely to be in positions of banking or mercantile through centuries-old policies forbidding them from working the land or holding office; it's not like the Jews were in a righteous spot prior to Hitler and it's not like Europe hasn't been turning on them every 50 years or so like clockwork going back to the goddamn Roman Empire.
At a base level, Donald Trump is a billionaire TV star who railed against the power structure of the elites based on his reception on Twitter. He came to notice through a TV game show and grew to fame questioning the legitimacy of a popular president. He's happily scapegoated Mexicans and Muslims, but never with any consistency or repeatability. Whereas Hitler had Mein Kampff, the majority of Donald Trump's The Art of the Deal wasn't even written by him. The Mexicans, for their part, apparently make the best taco salads and muslim women don't talk because their husbands don't let them.
...see, Germany was in a bad.fucking.way during the Depression. America has rising inequality. Hitler was a single-minded ideologue who deeply believed that the world needed to return to a primordial "survival of the fittest" state for the betterment of all mankind and if the Jews managed to wipe out the Aryans, it was proof that the Jews were superior so better fucking get the jump on them first. Trump?
Trump is about Trump. And I know he's said some shockingly callous shit about protestors and secret service and all the rest but he says this horrible shit with no planning and no forethought and no introspection into the consequences of his words.
Hitler was a premeditated mutherfucker who took a country literally burning money for warmth and mobilized it into WWI part II. Trump is a rich douchebag who likes people to notice him. I know everyone's all twitterpated that he's about to have launch codes and shit but for a dude who legit went to military academy he's shown a single-minded disinterest in foreign policy or military escapades of any kind.
So who's going to start the goose-stepping? David Duke? 3% of the vote, yo. The III% Well... similar problem.
Trump and his supporters aren't even figuratively Hitler. They're pissed off Americans that don't need to understand the problem to demand a solution and Trump never has and never will burn down the Reichstag.
It would just mean more work for him.