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Civilizations refers to a means to organize groups of people around common: culture, race, ethnicity, language, religion, national boundaries, etc. The organizing principles are not concrete. Questions about civilizations should be definite in scope, and related to the particular characteristic(s) that tie the civilization together.

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When Europeans discovered Americas they also imported plagues. These plagues were one factor of the collapse of the pre-columbian cultures. http://www.examiner.com/article/apocalypic-mysterious-plag …
answered Apr 23 '16 by knut