The collapse of Classic Maya civilization
In the last century of the Classic period, Maya civilization went into a decline from which it never recovered. Beginning about 790 in the western edge of the Central Subregion, such ceremonial activity as the erection of stelae virtually came to a standstill. During the next 40 years this cultural paralysis spread gradually eastward, by which time the great Classic civilization of the Maya had all but atrophied. A date in the Maya calendar corresponding to 889 is inscribed on the last dated monuments in the Central Subregion; soon after the close of the 9th century it is clear that almost all of this region was abandoned.
For this event, which must have been one of the greatest human tragedies of all time, there are few convincing explanations. It now seems that the Classic Maya civilization in the region of its greatest development went out “not with a bang but a whimper.” Massive foreign invasions can be discounted as a factor, but non-Maya elements did appear in the west at the same time as ceremonial activity terminated. These became the inheritors of whatever was left of the old civilization of the Central Subregion after 900 ce, having established trading colonies and even a few minor ceremonial centres on its peripheries.
Whatever incursions did take place from the west were piecemeal and probably the result of the general decline, rather than its cause. Similarly, there is little reason to believe that there were peasant revolts on a general scale. The only real fact is that most of the inhabitants of the Central Subregion went elsewhere. Probably some were absorbed by such still flourishing ceremonial centres of the Northern Subregion as Uxmal and Kabah, while others might have migrated up into the congenial highlands of Chiapas and Guatemala. Although a population explosion and severe ecological abuse of the land must have played their role in the tragedy, the full story of the decline and fall of this brilliant aboriginal civilization remains to be told. Michael Douglas Coe Gordon R. Willey The Editors of Encyclopaedia Britannica