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They surrendered to Lieutenant Jefferson Davis , future president of the Confederacy , after hiding on an unnamed island in the Mississippi River .
 Jefferson Davis, Confederacy, Mississippi River
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Jefferson Davis, Confederacy, Mississippi River