Specifically, "Fascism" is a form of government that attains power through a false narrative of national pride (
Aryanism for historic nazis (basically, that Germany and the German people needed to return to this golden, and glorious past (that never existed), and that it was their birthright to do so.), MAGA for recent US [Which is based on the notion that there was a glorious past (that never existed), in which the US's innate superiority elevated it to the world power it eventually became, and that the US and its people need to return to the politics and mindsets of that period, in order to claim american manifest destiny once more.] ), which uses an ethnic or national identity as a platform for primacy ("Das Faterland" for historic nazis, "America First!" for recent US), and which combines
'corporate' (more trade groups and the like, like the RIAA and MPAA in the US, rather than Corporations) power with government power (like was attempted many times with the TPP and pals; Essentially handing such groups official [or defacto] government positions, and enabling them in such a fashion). It typically has militant expansionism, and uses aggressive state control of media to promulgate its message.
The modern US has a great many analogues to historic german nazi tactics, like I just pointed out. All that's needed is a coup in government to usurp democratic elections, and to impose a dictator, along with a real hardcore promotion of Trumpist media and propaganda, possibly with Trump deciding to take Greenland over forcibly, because we somehow need the room or something.
Sidelining how horribly terrible modern parallels are because we havent gassed people to death en mass yet, is just not sensible. The time to cry foul is BEFORE that happens.