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The Polish Border Strip ( ; ) , also known as the Polish Frontier Strip , refers to those territories which the German Empire wanted to annex from Congress Poland during World War I. It appeared in some plans proposed by German officials as a territory to be ceded by the Kingdom of Poland to the German Empire after an expected German and Central Powers victory .
 German Empire, Congress Poland, Kingdom of Poland, German Empire
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 German Empire, Congress Poland, Kingdom of Poland, German Empire