In Mesoamerica the Toltecs had abided to Tula, just north of modern Mexico City, and there they irrigated crops with the assistance of the Tula river being so close. The Toltecs developed a large population and powerful military that would then contribute to the capital becoming increase wealth of their capital. The Toltecs would have close relations with the Mayas and the cross-cultural interactions would assistance with the similar architectural designs to Chichen Itza. A civil dispute would be the downfall of the Toltec state. The Mexica, or the Aztecs, would come to abide the land around Lake Texcoco, and would create their capital Tenochtitlan (modern day Mexico City). The capital would thrive on an agricultural society, but the lake also would supply the community fish, frogs and waterfowls to eat. The irrigation system the Aztecs would create assists them through the dry seasons by getting into the canals built. The Aztecs would then conquer the land all the way to the Gulf of Mexico. The Mexica would join forces with other Texcoco and Tlacopan creating the Aztec Empire. The Aztec Empire would be divided into small states and would trade within on another.
Work cited
Bentley, Jerry H., Herbert F. Ziegler, and Heather Streets-Salter. Traditions and Encounters: A Brief Global History. 3rd ed. Vol. 1. New York, NY: McGraw-Hill, 2016.