Not that it matters but it feels closer to historical fiction than science fiction. Yes, this history happens to be in the future rather than the past, but in either case there is a lot of speculation about a culture or context removed from the present day. I suppose the difference is that there's an implied message of, "this can still happen if we let it" vs assuming that humanity is currently too enlightened to ever fall back into whatever old way of being. It feels like a failing of how we teach history that kids come away from youth thinking things like, "well nazis were bad but that was the olden days, now we all know better."