What was one factor that may have caused Mayan cities to fall into ruin between 800 and 1000 BCE?

this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.

they thoght they were going to nuke each other