"War! Huh!..."

This short video suggests that the Maya collapse was anything but uniform and rejects the drought hypothesis. 

With recently uncovered written evidence, it states that large-scale war between Mayan cities was the cause of population decline. However, while such battles may well have occurred and resulted in loss of life, this theory cannot be extrapolated for the entire Mayan empire and all urban centres based on evidence from one site. Furthermore, the overwhelming evidence that there was a significant period of drought at the time of collapse cannot be simply ignored.

While Mayan cities may well have fought battles, as this evidence suggests, it is most likely that they were only localised and did not cause the collapse across the entire empire. Furthermore, such fighting may well have occurred as a direct result of the drought. As food and water supplies declined, the Maya may well have engaged in battles for resources. It is also known that as drought conditions worsened many Mayan cities intensified their human sacrificing and so such battles may well have been waged in order to sustain supplies of these victims.

Civil war may well have played a part in the collapse of the Mayan civilisation but such strong evidence for a widespread and intense dry spell cannot be ignored. It seems likely that it was the drought itself that may have sparked the violence.