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Organised by USA Track and Field , the ten-day competition lasted from June 19 until June 28 and served as the national championships in track and field for the United States .
 USA Track and Field, 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:
 USA Track and Field, United States