when did the aztec empire begin?
The Aztec Empire, or the Triple Alliance, began as an alliance of three Nahua altepetl city-states: Mexico-Tenochtitlan, Texcoco, and Tlacopan. These three city-states ruled the area in and around the Valley of Mexico from 1427 until the combined forces of the Spanish conquistadores and their native allies under HernÃ¡n CortÃ©s defeated them in 1521. The Triple Alliance was formed from the victorious faction in a civil war fought between the city of Azcapotzalco and its former tributary ...