Answer:
The preclassic period covers approximately from 2500 a. C., probable date of the elaboration mainly of the first Mesoamerican pottery; until 200 d. C., in which the fall of Cuicuilco was consummated and the flowering of Teotihuacan takes place. Throughout this period there is a process of evolution acting from egalitarian agricultural societies towards more stratified ones that will conclude with the formation of the Teotihuacan national State.