(in a political context) favouring free enterprise, private ownership, and socially traditional ideas
Conservative implies right leaning, centrist implies opposed to large scale change
One can be a radical conservative, and one can be centre-left
The word I was looking for is "centrist"
That still doesn't prove the claim "America was always fascist"
Partially because being copied by the Nazis doesn't intrinsically mean you're fascist (they copied a hell of a lot of things, including but not limited to fascism)
And partially because that doesn't cover the "always" part at all