1 gen 800 anni - Chichén Itzá unifies Maya
Descrizione:
 Chichén Itzá is a city-kingdom, by the way.
Probably the most peaceful city-kingdom. Instead of killing or enslaving captured enemies, they integrated them into their own society. 
Eventually, they proposed that all the Maya get together permanently and just stop fighting, which was a pretty solid idea, since they had basically the same culture and systems.
Most other city-kingdoms agreed to let Chichén Itzá rule Maya society. 
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