To understand means to simplify. (RussianПонять - значит упростить) [From Strugatsky's SFnovelВолны гасят ветер (Waves blow out the wind, translated to English as The Time Wanderers)]
... River Indian Tribes[?]
Chemehuevi Indian Reservation[?]
Fort Yuma Indian Reservation[?]
Cocopah Indian Reservation[?]
San Xavier Indian Reservation[?]
Tohono ...