The Mayan civilization flourished in Central America between 300-900 AD, settling in dense rainforests where they cleared land for homes and farming. Their largest city was Tikal in modern-day Guatemala, and they organized into independent city-states each led by a ruling chief, who was sometimes a woman. The Mayans practiced polytheistic religions, making sacrifices atop tall pyramids to deities. By around 900 AD, the Mayan cities were mysteriously abandoned, possibly due to overpopulation, environmental degradation, or peasant revolts against heavy taxes.

17. Mayan 365 day calendar with 260 day calendar added