Well...
The US has never been fascist because American Capital has never collectively felt threatened enough to the point of throwing away the pretenses of liberal democracy in favor of a class collaborationist mimicry of "socialism" under a direct dictatorship of the bourgeoisie without the smoke and mirrors. The closest they got to doing that was in between the Great Depression and FDR's successful implementation of the New Deal. In the course of the latter, some bougies felt so pissy about relinquishing some power and concessions to the proles under the ND's progressive program that they tried to bring about fascism themselves. This is not to say that not being fascist doesn't mean you can't work with and enable fascists, as most of 20th century to the present shows.
I'm against labeling the US as fascist because not only is it anachronistic but it also lets liberal "democracies" off the hook given how awful they've historically been. Just like I wouldn't label Ancien France as "fascist" either. Fundamentally, liberalism, fascism and "traditionalism" are all just tools in the box for Bourgeois rule. It has nothing to do with the supposed "sanctity" of the system holding back the tide of fascism as liberals see it.