Abstract
   
The term "civilization" in the theory of civilization clash include religion, ethnicity,nationality and other factors.Originally,this theory is a reflection of American domestic political situation.The clash of civilization is a result of civilizations being challenged rather than that of differences between civilizations;a contradiction between monotheism and polytheism rather than a conflict between Islam and Christianity.Terrorism is a kind of conflict between civilized world and ideological barbarism while its classification and features have close relationship to differences of civilizations.

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