Why did farmers in Mesoamerica move their farms from time to time?

Mesoamerica fatmers moved their farms from time to time as their families grew larger. Aside from that, there were also conquering armies that took over their land and forced them to leave. In terms of natural causes, there were also heavy rains flooded their fields, forcing them to find new land.

Explanation:

it was a act of seld fesnse more over it was a peace treaty between the fogein contunries.