367787
In 1891 , the Great Sioux Reservation having been reduced and divided , after the ratification , of the treaty of 1889 , the fort was abandoned and the Cheyenne River Agency was moved fifty-six miles up the Missouri River , opposite Forest City , Potter County , South Dakota , where administered the affairs of these Indians .
 Great Sioux Reservation, Cheyenne, Agency, Potter County , South Dakota
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Option: location, person, organization 
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Answer:
 Great Sioux Reservation, Cheyenne, Agency, Potter County , South Dakota