What did the Aztecs capture other tribes and kill them

They captured them as a human sacrifice to their gods.

When you think of the Aztec, what comes to mind? Perhaps you think of the Spanish conquistadors or their beautiful capital at Tenochtitlan. What comes to mind for a lot of people is their practice of human sacrifice. In class, we learned a lot about the civilizations of the Maya and the Inca but not much about the Maya. Chapter 13 of the assigned readings talks about the Aztec and how they came to power and their collapse. One paragraph in the chapter, although morbid and disturbing, caught my attention. "The victim was stretched out over the sacrificial stone. In seconds, a priest with an obsidian knife broke open his chest and ripped out his still beating heart, dashing it against the sacrificial stone." These sentences refer to the ritual of human sacrificed practiced by the Aztec priests