The Maya Collapse Wasn't Just a Drought Story
For decades, the standard account of the Classic Maya collapse has fit into a single sentence: the rains failed, the harvests failed, the cities emptied. Between roughly 750 and 900 CE, the great centers of the southern lowlands stopped carving monuments, royal dynasties dropped out of the inscriptions, and populations fell sharply. Since the 1990s, when researchers first pieced together regional climate records, a long, severe drought has been the leading explanation. The Washington Post returned to the question on October 19 with a report arguing that the real story is more complicated — and the newest evidence supports that.
Benjamin Gwinneth, a geographer at the Université de Montréal, and colleagues examined sediments from Laguna Itzan in Guatemala. The core captures 4,000 years of environmental change, and the team published its findings in Biogeosciences in 2025. Their conclusion: there is no drought signal at the site during the period when its population disappeared. "Even though there were no drought conditions locally, the population of Itzan declined sharply during the Terminal Classic period, between 1,140 and 1,000 years ago," Gwinneth said. Population markers collapse, signs of farming vanish, the site is abandoned.
None of this erases the droughts. A University of Cambridge team reconstructed wet-season rainfall year by year from a stalagmite in a Yucatán cave, published in Science Advances. Between 871 and 1021 CE they counted at least eight wet-season droughts lasting three years or more, the longest running 13 consecutive years. Monument construction and political activity at northern sites, including Chichén Itzá, stalled at different points inside that window of climate stress.
Gwinneth locates the answer in interconnectedness. Maya cities were not isolated; they formed a dense web of trade relationships, political alliances and economic dependence. When drought hit the central lowlands, the shock traveled along those links: wars over resources, the fall of royal dynasties, mass migration, broken trade routes. Stable cities were dragged down by unstable partners. A 2025 study in the Proceedings of the National Academy of Sciences led by UC Santa Barbara archaeologist Douglas Kennett reached a compatible conclusion: the abandonment of cities occurred while climatic conditions were improving, and urban growth itself was driven by a blend of climate downturns, intergroup conflict and agricultural economies of scale.
Material evidence tells the same story from another angle. GreekReporter described a Maya polychrome vessel, catalogued as U0186 and roughly 1,200 years old, that survives only in photographs taken in 1979. Joanne Baron identified it in the photographic archives at Dumbarton Oaks in Washington, D.C., and published her analysis in Ancient Mesoamerica. According to the imagery, the vase belongs to the "Holmul Dancer" tradition and depicts a political order coming apart in the early ninth century, as older dynasties weakened and new centers of power rose. Photographs indicate the vessel was illegally removed from Belize in 1979 and sold for $14,000; its current whereabouts are unknown.
Scholars have proposed more than 80 theories, or variants of theories, to explain the collapse, and none commands universal assent. Many now prefer the word transformation: the southern capitals emptied, but Maya society continued in the north and in the Postclassic period. The Maya did not disappear. More than 6 million people identify as Maya today, speaking more than 28 Mayan languages.
The productive question is no longer which single cause killed the Maya, but which cities died of local drought and which died of a broken network. Laguna Itzan is still accumulating sediment, so future cores can trace how the landscape recovered after the city emptied. The lesson travels: dense connections amplify prosperity, and they amplify a regional shock just as efficiently.