Gaviotas

https://en.wikipedia.org/wiki/Gaviotas

'A successful research prototype for local production under extreme constraints — not a viable model for mass prosperity.' [1]

Gaviotas proved that:

Production capability is more fundamental than governance, ideology, or capital in the early phase of civilization-building.

It answered:

“Can humans build productive systems anywhere, starting from almost nothing?”

It did not answer:

“How do we build a prosperous, scalable civilization?”

That second question remains open. [2]