So the Republicans in the Civil War were fascists who defeated the equally fascist Plantocracy in the Confederacy

Not equally fascist, but differently so. It works out pretty well as a great example, though - fascists enjoy power, and the fight in both cases had to do with, well, you guessed it - power.

I'm not sure a regime exists that isn't fascist to some degree. But there's definitely a level of tolerance for it that appears to be more flexible the further leftward one slides down the scale.