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Historical background After the U.S. invasion of Puerto Rico in 1898 , the Island 's political status within the US became a subject or ardent conversation within Puerto Rican political circles .
 Puerto Rico, Puerto
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Puerto Rico, Puerto