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The Jackson Purchase is a region of western Tennessee and southwestern Kentucky , bounded by the Tennessee River on the east , the Ohio River on the north , and the Mississippi River on the west , that was ceded to the United States by the Chickasaw Peoples in 1818 .
 Jackson, Tennessee, Kentucky, Tennessee, Mississippi, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Jackson, Tennessee, Kentucky, Tennessee, Mississippi, United States