The US has always been a horrid settler colonial/imperialist hellhole, but I think it's a step too far to say that the US has always been fascist, or even ever has been, only because fascism is best viewed as a reaction to a powerful revolutionary left wing movement, and we've arguably never really had one of those in the US. Even at the height of the US left's power and legitimacy, I don't think you can really say it was in a position to seriously challenge capital.

But then again, fascism has always been a concept whose terms are a bit tricky to pin down, so this disagreement could very well just be a me problem.