In 1879, Richard Henry Pratt returns to Hillsgate, and invites Robert and Clara to join him in teaching at an experimental school in Pennsylvania designed to "civilize" Native American children.
在1879年，理查德·亨利·普拉特回到了希尔斯盖特并邀请罗伯特与克莱拉加入他在宾夕法尼亚的实验学校的教学，来“开化”美国的原住民孩子们。