Campo Indian Reservation was created in 1903.
Flathead Indian Reservation was created in 1855.
Rosebud Indian Reservation was created in 1889.
Mendocino Indian Reservation was created in 1856.
Cheyenne River Indian Reservation was created in 1889.
Poarch Creek Indian Reservation was created in 1984.
Table Rock Indian Reservation was created in 1853.
Pine Ridge Indian Reservation was created in 1889.
Prairie Band Potawatomi Indian Reservation was created in 1837.
Fort Belknap Indian Reservation was created on 1888-06-01.
Round Valley Indian Tribes of the Round Valley Reservation was created in 1856.
You would capitalize Indian but not reservation because Indian is a proper noun but reservation is not.