I think the natives were doing perfectly fine when there was no such thing as government. Sure they were living in dangerous times (famine, diseases, etc) but they weren't constantly being watched by police. They had no idea what the IRS was. No Federal Reserve printing worthless paper to control the economy.

There was trading, there was some fighting, and plenty of land to go around. All sounds good to me.

But since everyone is ignoring the actual question because lets be honest, all countries suck in their own way, I feel compelled to throw OP a bone.

If a single country HAD to rule the world, I'd go with Australia. They're really laid back and get along with basically everyone. You ever hear of them getting in a war? Or experiencing one economic collapse after the other?

They protect their borders, so they're not overpopulated. Sure they're an island but the laws they have on immigration are respectable ones. They're not super rich, but they certainly aren't a third world country either. Aussis respect nature and aren't butchering their resorces, yet have plenty of thriving big cities too.

Also the drinking age there is 18