Though confined to the great Dakota reservation in 1878, the still-defiant Sioux did not end their struggle with the white man until well into the twentieth century. Throughout the last decades of the nineteenth century the Sioux-finding themselves united for the first time in their history-waged a cold war with the United States Department of the Interior, the Indian Bureau, the various Indian agents sent to supervise Sioux Reservation life, and the so-called Indian Friends of the East, who sought to ""school and church"" the Sioux into submission.