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GeistInTheMachine The problem is that the motivated people are on both sides. Our current system has the potential to improve without being totally dismantled, because what replaces it could be even worse.
The divide today isn't between red and blue states, it's between blue cities and red rural areas. As for the South, I live in Georgia, which has two Democratic senators and voted for Biden in the last election, mainly due to the influx of people into the Atlanta area over the past decade. Even in California, the rural areas are extremely conservative, they're just outnumbered by the liberals in SoCal and the Bay Area. There's no way to split the US up into different countries without massive displacement.
You should read the Federalist Papers, which make a good case as to why it's better to have a larger, unified country than several smaller ones. Look at what's happening in the UK, just from them leaving the EU. And if we had allowed the Confederacy to secede peacefully, there would have been an inevitable war over the lands to the west. And imagine how the 20th century would have been different if the Union had allied with the USSR and the Confederacy with Nazi Germany.