American culture is only homogeneous in their terms because they reject every American cultural framework but their own as illegitimate, a cancer to be burned out, a corruption of the true ideals which they believe they alone uphold. Talk to me about cultural unity when they stop talking about killing liberals for sport or calling LGBT people "groomers" or passing laws forcing women to flee from their states for fear of their own safety.
I don't want to fulminate - I'm getting angry just thinking about this - but if there's been a running theme in American politics in the last decade, it's been the destruction of the facade of cultural homogeneity by right-wing rural culture, and that's with a system designed to pander to them as much as possible, because apparently 245 years of shared history and heritage and citizenship in the world's last superpower isn't incentive enough to keep them in the union. At this point I almost welcome civil war just so we can just get it over with already.
Rant over. I need a break from this place before I get a talking to.