How do the concepts of "Cultural Relativism" and "Ethnocentrism" relate to the Mann article, Oldest Civilization in the Americas Revealed? short answer about 6 sentences https://bbhosted.cuny.edu/bbcswebdav/pid-74548082-dt-content-rid-564107046_1/xid-564107046_1 Charles C. Mann, 2005 - Oldest Civilization in the Americas Revealed. .