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1. The Ancient Period (5000 BC-500 AD)
2. The Medieval Period, from 500 AD to 1500 AD
3. The Modern Period, from1500 AD to 1914 AD
4. The Contemporary Period, from 1914 AD on (p. 28, 2)
(Newton, L. H. (1986). Ethics in America. New Jersey: Prentice Hall)