How did the Aztecs know where to build their new city of Tenochtitlan?

The Aztecs built their city of Tenochtitlan based on a prophecy that directed them to find an eagle perched on a cactus, devouring a serpent. This vision led them to the marshy islands in Lake Texcoco, where they saw the sign and established their city in 1325. The location also provided strategic advantages, such as access to water and resources, as well as natural defenses against potential enemies. Over time, Tenochtitlan grew into a powerful city-state and the capital of the Aztec Empire.