"Since most Americans today do not believe in seperation of races"

Well for starters I think you'd be surprised at just how many people are starting to really think about diversity and the separation of the races. You did have Charlottesville happen which suggests that there's an uprising that's about to occur. People are seeing past the lies that have been pushed on them from the left and are naturally gravitating towards the right. There is a difference between a National Socialist and a Neo-Nazi, two totally different animals.

"How the heck would it even be possible without a tyranical dictator to force such a rediculous thing unpon everyone?"

I could see it happening as a result of people just deciding to go along a spectrum of whiteness as opposed to say just pure German or Swedish per say. Who knows maybe if the left doesn't quit with their non sense they'll spark the next racially inspired race war. It could only happen if our brothers of the faith went out and red pilled as many people as possible. If I had to guess I would say it's already happening as we speak.