What are the 2 theories for the collapse of the Mayan?
following links are the article on the Mayans and the website as well,
Lesson 6 Cracking the Mayan code article
Cracking the Code
There are several theories for the collapse of the Maya. None of them can be taken as the right one as different Mayan scholars have a different opinion on each one of them and have found strengths and weaknesses.
Two of the prominent ones are:
Epidemic Theory: According to this the Maya cities were struck by a disease which they did not have a cure against. This led to human death on a large scale and those who survived left the cities and moved to other lands.
Drought Theory: The Maya agriculture was dependent on large scale irrigation from external water sources. Due to the disruption in supply from many of these sources agriculture could not be carried out and people had to leave the major cities.