The document summarizes key aspects of three pre-Columbian Mesoamerican civilizations: The Aztecs began in 1325 BCE as nomadic hunter-gatherers who later established the city of Tenochtitlan. Their social hierarchy ranged from nobles and priests at the top to peasants and slaves at the bottom. They practiced human sacrifice as offerings to the gods. The Incas inhabited the region of Tawantinsuyu and built cities based on a grid plan centered around open plazas. They constructed impressive stone structures and exploited gold which was symbolic of their sun god. Religion involved oracle consultations, sacrifices, and confessions. The Maya were not a unified state but