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The league received approval from the United States Football Federation at its May 27 , 1921 meeting and began its inaugural season in September .
 organization: United States Football Federation
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: United States Football Federation 
Answer:
 organization: United States Football Federation