What does archaeologist tom sever think caused the maya downfall?

Tom Sever thinks the main cause of the Mayan fall was the unplanned ways of agriculture which led to drought and deforestation.

Explanation:

The Mayan did not cared for the land type and the seasons for the plantation of crops which led to a disturbed climate. This disturbance in the climate led to deforestation and the water table imbalance brought the drought. These were the main reasons of the Mayan downfall. However these two natural calamities were the result of unplanned plantation which was carried out by the Mayan farmers.

missouri compromise of 1820 which prohibited slavery

i know number 8 is something about only using 3/5 of the slave votes.