The Classic Mayan Collapse
Paragraph 1：The Classic Mayan civilization, located in the lowlands of present-day southern Mexico and Central America, began a precipitous decline around A.D. 900. The majority of the people abandoned their great urban centers, buildings were no longer kept up, and carved monuments — a hallmark of the civilization — were no longer created. Various theories about this collapse have been explored, such as invasion from foreigners, natural disaster, disease, failure of agricultural techniques, and internal revolt, although it is a combination of factors that probably constitutes the ultimate explanation.
