New countries needed?

I suggested a few days ago that the original, native Americans should be able to form their own, sovereign nation on the North American continent, perhaps taking over the Dakotas (or wherever else they were chased out of) - on the same principle that saw the creation of Israel. So I was pleasantly surprised to read an interview on the FiveThirtyEight website with a guy who thought that the United States should (or indeed would inevitably) be broken up into separate countries. The suggestion arises for mainly domestic reasons, but wouldn’t the break up of the U.S. not have international advantages too? The U.S. seeks to be a monopoly, and prides itself on its self-image as a ‘good guy’ maintaining the liberal order. We all know the reality behind that. But since Trump seems to believe that the E.U. should fall apart, why shouldn’t we reciprocate?  The break-up of discongruous states has been a post war trend, from the Soviet Union through Czechoslovakia, Yugoslavia, Sudan, quite possibly the U.K, Spain, Canada, Belgium and others, perhaps including China which should at least free Tibet and stop eyeing up Taiwan. The desire for autonomy seems fairly universal, and the U.S. has its own variation of this theme with the anti-Washington ‘States’ Rights’ constitutional claim. How different the world would look if north of Mexico and south of the 49th parallel there existed 49 separate countries. It would still leave two or three of them in the G20.