There are 193 UN recognised countries, two UN observer states (the Vatican and the Palestinian Authority), and plenty of partially recognised or disputed countries. But what if there was more?
Leaving aside factors like natural resources, stability, population, etc., what countries do you want to exist, simply because it would be pretty neat? Joke answers are acceptable and encouraged.
World without borders, is the world without escape. Now we have different jurisdictions, which limits the reaches of power of governments. You can move to a country with less oppressive laws, or at least get news from there. Different jurisdictions makes things like TOR and VPN work for censorship circumvention and privacy.
Besides earth federation would subvert any diversity we as humanity have. I would prefer more small countries gaining sovereignty than big empires(federations) growing. Power should be decentralized, not the opposite.
You can have political / economic union but cultural diversity. In fact you can even have political and legal diversity among the subdivisions. There already are a bunch of countries that work like this, such as Malaysia, Nigeria and Belgium.
Except in the current disorganized world we always just end up with one or two superpowers bullying the little governments and crushing all kinds of diversity anyway.
Also,
That might work for the crafty and well-resourced individual who has a go bag and good OpSec and can actually hop borders and keep their heads down, but that sort of thing is nearly impossible for, like, a single parent working for a crap hourly wage, or an unhoused person dealing with an extended mental health crisis, or other more vulnerable people. Justice shouldn’t depend on geography.
Only matters because of corruption and bad actors. Like I said, that kind of world would require a huge change to human nature itself to work. Whether it’s 1 global government, or full anarchy.