- The Aztec Empire flourished between 1345-1521 AD and dominated northern Mesoamerica, imposing Aztec ideals across Mexico through military conquest. They were highly advanced in agriculture, trade, and produced fine art and architecture.
- By 1400 several small empires had formed in the Valley of Mexico, including Texcoco and Azcapotzalco. In 1428 the Azcapotzalco were defeated in the Tepanec War by an alliance including Tenochtitlan and Texcoco, who then formed the Aztec Triple Alliance dominated by Tenochtitlan.
- The Aztec Empire expanded through military conquest led by the Emperor from Tenochtitlan, covering