What was the 3 main ancient civilizations in early America?

The three main ancient civilizations in early America were the Maya, the Aztec, and the Inca. The Maya, located in present-day Mexico and Central America, were known for their advanced knowledge in astronomy, mathematics, and writing. The Aztec, based in central Mexico, built a powerful empire and are famous for their intricate religious practices and monumental architecture. The Inca, in South America, established a vast empire in the Andes, known for their sophisticated agricultural techniques and extensive road systems.