This lasted until

This lasted until around 900 AD, when the Classic Maya civilization collapsed.[9] The Maya abandoned many of the cities of the central lowlands or were killed off by a drought-induced famine.[10] Scientists debate the cause of the Classic Maya Collapse, but gaining currency is the Drought Theory discovered by physical scientists studying lakebeds, ancient pollen, and other tangible evidence.[11] A series of prolonged droughts in what is otherwise a seasonal desert is thought to have decimated the Maya, who were primarily reliant upon regular rainfall.[citation needed]

The Post-Classic period is represented by regional kingdoms such as the Itzá and Ko'woj in the lakes area in Petén, and the Mam, Ki'ch'es, Kack'chiquel, Tz'utuh'il, Pokom'chí, Kek'chi and Chortí in the Highlands. These cities preserved many aspects of Mayan culture, but would never equal the size or power of the Classic cities.

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