21118
Most American Indians east of the Mississippi River were affected by the war , and many tribes were divided over the question of how to respond to the conflict .
 location: Mississippi River
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Mississippi River 
Answer:
 location: Mississippi River