The Office of Indian Affairs Its History, Activities And Organization by Laurence F. Schmeckebier

The Indian policy of the government falls into three periods: 
(1)The Treaty period up to 1871; 
(2)the Reservation period from 1871 to 1887; and (3)the Allotment and Citizenship period from 1887 to the present time. 
-The Office of Indian Affairs Its History, Activities And Organization 
by Laurence F. Schmeckebier