A large, sustainable and egalitarian community at the height of the Copper Age The Chalcolithic site of Valencina de la Concepción in Seville was permanently occupied for a thousand years, between 3300 and 2150 BCE, by a community of several thousand inhabitants who organized themselves in an egalitarian manner and reached a high level of economic sustainability based on cooperation and diversification.
https://phys.org/news/2025-04-....large-sustainable-eg