Fascism is Capitalism in decay, the violent immune system employed by the Capitalist class. A great work on fascism is Blackshirts and Reds. I can provide a longer Marxism intro reading list if you'd like, but Blackshirts is a great start.

You could argue the US has always been “fascist”, just that the fascism has been focused on people outside it

Hitler was inspired on how to treat the Jews, Romani, disabled, and queers, based on how we treated Native Americans and Black Americans. He saw the country doing so well in the world stage excluding millions from the same status and privilege as the normalized default, and thought it would work for Germany and Europe, by force.

America was founded by rich white oligarchs, it was never going to support anything good without a lot of people letting go unless they died.

EDIT: Sorry if you get double pinged, server had a hiccup as I was posting.

https://acoup.blog/2024/10/25/new-acquisitions-1933-and-the-definition-of-fascism/