With a made up space rock that solves all technology problems. And a made up magic herb that solves other problems, and perpetuates a single bloodline monarchy..
All the while using the aforementioned technology to create the shield and cloak keeping any and all neighbours oblivious to the truth and firmly outside.
But remember, ethnostates are only bad if done by the wrongthinkers.
With a made up space rock that solves all technology problems. And a made up magic herb that solves other problems, and perpetuates a single bloodline monarchy..
All the while using the aforementioned technology to create the shield and cloak keeping any and all neighbours oblivious to the truth and firmly outside.
But remember, ethnostates are only bad if done by the wrongthinkers.