The Dawes Act of 1887, which allotted tribal lands in severalty to individuals, was seen as a way to create individual homesteads for Native Americans. Land allotments were made in exchange for Native Americans becoming US citizens and giving up some forms of tribal self-government and institutions. It resulted in the transfer of an estimated total of from Native American control. Most was sold to individuals or given out free through the Homestead law, or given directly to Indians as individuals. The Indian Citizenship Act of 1924 was also part of Americanization policy; it gave full citizenship to all Indians living on reservations. The leading opponent of forced assimilation was John Collier, who directed the federal Office of Indian Affairs from 1933 to 1945, and tried to reverse many of the established policies.