I think we’ll see Europe crack up before America. 

I’m sure some of the smaller units will form confederacies. No reason to think it’ll be the same arrangement everywhere. 

Undisciplined

Will it persist as a form of confederacy, or full city state sovereignty?

As long as belief in system will persist, I don't think something would change if governments wouldn't go full in planned economy. Well, EU still would blow up in 20-30 years I think, too many idiotic decisions they made. And UK if they won't reverse their course into madness.

AskSN

How Many Countries Will Exist in 100 Years?

Will it persist as a form of confederacy, or full city state sovereignty?

As long as belief in system will persist, I don't think something would change if governments wouldn't go full in planned economy. Well, EU still would blow up in 20-30 years I think, too many idiotic decisions they made. And UK if they won't reverse their course into madness.