9530
*1867 : With the Kingdom of Prussia , the Province of Pomerania and Pomerelia within the Province of Prussia join the North German Confederation ( 1867–1871 )
 Kingdom of Prussia, Province of Pomerania, Pomerelia, Province of Prussia, North German Confederation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kingdom of Prussia, Province of Pomerania, Pomerelia, Province of Prussia, North German Confederation