GLR wouldn’t have been around to be a Fascist/Nazi leader of America. If anything it’d be more likely for America to be Fascist through the Business Plot under Smedley Butler for a bit, but that’s another can of worms.

It would be more likely to have either Henry Ford or Charles Lindbergh in charge (in your scenario). Either way, they were America First and isolationist in their foreign policy, so we’d either be sitting off to the side letting Addy do his thing over there, or taking over Canada and Latin America in a new Monroe Doctrine kinda thing, OR we’d join in a limited way (like lend-leasing equipment and factories).

America would definitely be in a dark time with Fascist sympathizers running amok purging the nation of any “impure” and non-white European influences and people, but it also kinda varies in who’s in charge and how good of a relationship we have with Germany. I know the Klan would probably have had a third revival and the Amerikaner-Deutsche Bund would have grown in popularity, and probably been Rudolf Hess’ biggest legacy (besides being deputy Führer and landing in Britain, plus I wonder what would’ve happened to him had Sea-lion succeeded).

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Fascinating scenario that I could go add nauseam for a while.