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Its frequent use following the end of the Cold War suggested to many that a new norm of military humanitarian intervention was emerging in international politics , although some now argue that the 9/11 terrorist attacks and the US " war on terror " have brought the era of humanitarian intervention to an end .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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