Sorry but I think the idea of the USA splitting into two countries is absurd. We haven't even done a truth and reconciliation process for our Civil War, never mind a proper reconstruction. The bitterness persists and will always be an undercurrent unless addressed in good faith as a national project.
So in case of a 21st century breach of our federal republic: which war shall the two new countries fight first? The one with each other, finish the Grey v Blue war? Or the one where the New Greys take on China and the New Blues take on Russia?
Mind you, China and Russia are both laughing their asses off if they are reading this drifty departure from a thread topic about the Supreme Court and a replacement for the late Justice Ginsburg.
We can't even agree on how to prevent a politicized minority court from overriding the will of the majority as expressed in selections of a president and Congress, so we decide instead to think about dividing the country in two and having two courts, two presidents, four houses of Congress... and no money,,,, thanks to covid-19 and a bunch of unfunded tax cuts?