Would you rather live in the "left" country? One that is completely diverse in races, cultures and religions. A very liberal country that is in favor of things like taking in refugees and providing a lot of social programs for everyone. The general idea of this country is that no matter what you do, the government will take care of you.
Or
Would you rather live in the "right" country? One that is mostly white with a much more conservative culture. A country that is mostly Christian and in favor of things like outlawing abortion, banning admission of refugees and offering very few social programs. The general idea of this country is that if you don't work, you don't eat.
Or
Would you rather live in the "middle of the road" country? One that is basically how the US is today.
I don't see the US being able to come together and be great again at this point because we are so completely divided. It seems like the car has run out of gas and we are just coasting at this point. Eventually we are going to grind to a halt. It might seem like splitting up into different countries is a step backwards, but humans are not yet enlightened enough to let go of it all and just exist together. Sadly, I believe we will destroy ourselves before we get to that enlightened state. I estimate we might have 100-200 years left before we destroy ourselves or the planet. Anyways, what would you pick, and why?