The Aztecs maintained their empire by imposing tribute on the territories they had conquered while also enlarging it through military conquest. The new Aztec subjects were required to pay Tenochtitlan tribute every 80 days.
According to mythology, the Aztecs came from a place called Aztlan, which would later become modern-day Mexico. Many academics think that the Mexica—as the Aztecs called themselves—migrated south to central Mexico in the 13th century, but it is unclear where Aztlan was.According to tradition, their patron god Huitzilopochtli gave the Mexica the order to found Tenochtitlan. According to tradition, Huitzilopochtli instructed them to establish their village where a large eagle eating a serpent was perched on a cactus. Tenochtitlan was named after this town in the Mesoamerican region of Anáhuac, which was built on a chain of five interconnected lakes. Tenochtitlan was established about 1325 CE, according to archaeologists.
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Evolution of guns or you could say weapon technology