It is painful to be reducing the future of America to a simplistic metaphor—or to a comic book concept. But here goes.
For Trump, reality is Trump. Trump Earth. Trump World. Trump Universe. Nothing else exists.
For everybody else, reality is everything else. Not-Trump Earth. Not-Trump World. Not-Trump Universe.
It is really that simple. A little practically complicated because Trump is president. But conceptually, just that simple.
The battle has already started and is likely to get worse before it gets better. For examples, see the various series in the comic book world, such as Crisis on Infinite Earths. Not pretty, with lots of collateral damage. The good news is that in the long run, the good guys and good gals win. We hope.