https://tim.blog/2022/07/04/balaji-srinivasan-network-state/
Balaji talks a bunch about how to define a Nation-State. I'd define it as a boundary for coordination. He mentioned how the USA is now looking like 2 different nations / states; and how the red nation is scattered across counties and the blue nation is as well, but the 2 nations are digitally more distinct.
I feel like Balaji is sort of talking about Glen Weyl's polypolitanism without calling it that.