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