There doesn't have to be a superpower alternative, power fills a vacuum, it doesn't spontaneously grow on it's own. The US has a lot going for it, but it's got

There doesn't have to be a superpower alternative, power fills a vacuum, it doesn't spontaneously grow on it's own. The US has a lot going for it, but it's got one thing, the only thing that leads to polticial upheaval, that's bad: the population does not view itself as one people, or even as disparate allied peoples. We have been propagandized to hate each other. Check all the boxes you like, this fact alone has one outcome.