What explanations do historians offer for the disappearance of mayan city states?

The disappearance of Mayan state remains the greatest mysteries even to historians or Mesoamerica history. There are many theories that even explain what happened, one of those example is that there was an uncontrolled warfare of Mayan and city states. And also there was a theory that the Mayan migrated away from the old Mayan hearland and go back to their village life. The jungle reclaimed the great plazas and pyramids. Stone by stone.

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

explanation:

i believe it would be capitalism