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This series of games which included F.C. Seattle , the Victoria Riptide , F.C. Portland and the San Jose Earthquakes led to the creation of the Western Soccer Alliance which later merged with the American Soccer League to form the American Professional Soccer League , the forerunner of the USL First Division .
 F.C. Seattle, F.C. Portland, San Jose Earthquakes, Soccer, American Soccer League, Soccer, USL First Division
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 F.C. Seattle, F.C. Portland, San Jose Earthquakes, Soccer, American Soccer League, Soccer, USL First Division