There's no evidence any country could ever be infinitely sustainable. However, on a global scale, America is far from some shrinking empire, and it's far from the only country struggling with changing demographics.I think that making this argument ignores that white people are becoming a minority in the country and that black and brown people, women, and the LGBT community are willing to loudly voice their desire for certain human rights in a way that they never have before in our history, and that is the context which makes this moment in our history a bit different than the past 200.
No, the current situation cannot persist indefinitely. But I don't see any reasonable indication that's even possible (as you note, the shifting makeup of the country has already put a clock on minority rule). Change will come as it always has: slowly.
Splitting the country isn't a rational course of action, and I don't believe that there exists the will or the means to actually make it happen (most states are not self-sufficient and don't really have much choice, and those that could do it have so much to lose that it's just not worth it).
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