humans need a natural eugenic civilization

my personal suggestion is to create cities on opposite coasts of a continent, like in the United States: we’d have birth cities on the West, and living cities on the East; after you are of a certain age you’d have to walk the wild in-between and if you make it you get to reproduce, if you don’t make it that’s eugenics.

this would help humanity maintain equilibrium with nature (immune system, strength, intelligence, etc.).