I am studying for finals and I need big time help

By A.D. 900 the Mayan culture began to decline. It is not entirely clear as to why, however many historians believe that war broke out between different members of royal families. This civil war made farming difficult, and as a result, many people died from hunger and disease. By the late A.D. 900s almost all signs of this once great civilization were gone.

I know this isn't really helpful but try this website :-
http://www.learner.org/interactives/collapse/mayans.html

~ let me know hw your doing :)
~ Sarah :D ~