Investigation of LiveScience 's `` Blue Hole '' indicates drought did in Mayan civilization . But by 900 , most of the civilization 's cities , located in present-day Guatemala , El Salvador , Honduras and southern Mexico , had been abandoned . Mayan civilization peaked in end of era ; cities were abandoned by middle of first millennium . ` ` When you have major droughts , you start to get famines and unrest , '' says researcher .
Investigation of LiveScience 's `` Blue Hole '' indicates drought did in Mayan civilization . Mayan civilization peaked in end of era ; cities were abandoned by middle of first millennium . `` When you have major droughts , you start to get famines and unrest , '' says researcher .