Around the 11th century, a people called the Amaquemecan (after whom the municipality of Amecameca is named), migrated to this area following their leader Xolotl to look for a better climate and more food to sustain themselves. This same Xolotl founded the Tenayuca Oztopolco chiefdom and made the first census ever in the Americas. The Acolhuas, Tepanecas and Otomis were already established in this land so alliances were made.
In the 11th century, a group called the Amaquemecan migrated to this area led by their leader Xolotl seeking better climate and food resources. Xolotl founded the Tenayuca Oztopolco chiefdom and recorded the first census in the Americas. The Acolhuas, Tepanecas, and Otomis were already present, leading to alliances being formed.