[ck2]

some disagreement emerges from the fact that there are several "cradles" of civilization, not just one where everything spread from

so they each have different timelines/landmarks

* https://en.wikipedia.org/wiki/Cradle_of_civilization

> The concept of a cradle of civilization has a focus where the inhabitants came to build cities, to create writing systems, to experiment in techniques for making pottery and using metals, to domesticate animals, and to develop complex social structures involving class systems

> Today, scholarship generally identifies six areas where civilization emerged independently: the Fertile Crescent, including Mesopotamia and the Levant; the Nile Valley in Northeast Africa; the Indo-Gangetic Plain; the North China Plain; the Andean Coast; and the Mesoamerican Gulf Coast