The civilization that flourished across southern Mexico, Guatemala, Belize, Honduras, and El Salvador for over three millennia — producing the Americas' only fully developed writing system, advanced mathematics including independent invention of zero, a sophisticated astronomical calendar, and monumental architecture. The Maya were never a single empire but a network of competing city-states whose Classic period peaked between 250 and 900 CE before a still-debated collapse that remains one of archaeology's central problems.
The Maya invented zero independently of India and the Islamic world. They mapped the movements of Venus to within a fraction of a degree. They built cities in rainforest that housed populations comparable to medieval European capitals. And then, in the ninth century, the great southern cities — Tikal, Palenque, Copán — went silent. The inscriptions stopped. The populations dispersed. The reasons are debated, studied, and not fully resolved. The Maya did not disappear — millions of Maya people live today and their languages are spoken across the region — but one of the ancient world's most sophisticated civilizations underwent a transformation so dramatic that it looks, from the outside, like collapse.