So far, only Wakanda.
Too bad it’s only fictional.
There were times in the middle ages and before where a few sub-Saharan African countries eclipsed those of Europe.
Deserts environments and hard winters force humans to plan ahead or die and over time they adapt to that need both physically and culturally. This gives these people an advantage over peoples living in gentler, more productive environments.
I believe that mega-cities serve some of the same purpose where the completion for resources forces the masses there to naturally separate into winners and losers where the winners stick it to the losers. In cities you always seem to see the rise of a despicable pimp-class composed of the best and brightest, the leaders of the criminal gangs, and their entitled spawn.
All of our major cities in America have been taken over by slowly by the criminal class. Now these thugs running our cities wish to rule the rest of the county. The Founding Fathers knew all about how great cities will inevitably try to crush the rest of the countryside around them to feed themselves as they fought off the ruling class of London, the Empire's capital.
America was the exception when our Constitution still bound down and constrained the natural inclination of any ruling class to enslave those below. We have to save The Republic or the lives of everyone in America will descend into a totalitarian dystopia that will make Detroit look like a paradise..
Yeah, but Wakanda has magical bullkrapium that can do whatever the plot needs at any time