The history of Mexico City stretches back to its founding ca. 1325 CE as the Mexica city-state of Tenochtitlan, which evolved into the senior partner of the Aztec Triple Alliance that dominated central Mexico immediately prior to the Spanish conquest of 1519–1521. At its height, Tenochtitlan had enormous temples and palaces, a huge ceremonial center, and residences of political, religious, militar... Wikipedia