Small villages found on the archaeological site that is south on New Mexico indicate that the Cuicuilco were an agricultural community around 1200 BC.
At some point between 800 BC and 600 BC, their city became an important cerimonial center, considering the size of the many monuments built by them back then. The people from that city even built a large pyramid with a 100m radius that had an circular base. The pyramid is about 20m high.
After that, they turned into a hierarchical society. It is estimated that their population reached about 20,000 people. Also, they developed a particular kind of pottery that was different from the other cultures of Mesoamerica.
I would say that their Pyramid was their great legacy.
The Tlatilco is also an archaeological site.
The more than 300 graves found revealed that their burials were made under the dwellings, apparently. Also, many of them showed showed evidence of dental mutilation as well as ritual cranial deformation.
Their statues made of ceramic represented woman in skirts or naked and the occasional male figure. Also, many of them had deformities or anomalies and female bicephalous figures.
Tlatilca agriculture was centered on corn, but also included beans, amaranth, and pumpkin. Birds, rabbits, deer and other animals were also part of their meals, though.
Tlatilca culture shows a marked increase in specialization over previous cultures. They most likely had specialized professions and a stratified social structure with complex settlement patterns.
Their greatest legacy is most likely their art.
