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This was the first major war in which all belligerents appointed protecting powers to represent their interests in enemy capitals , and the United States agreed to be the protecting power for the North German Confederation and several of the German states .
 United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 United States