Standing Rock Sioux
The Standing Rock Sioux Reservation was originally established as part of the Great Sioux Reservation and was established at Fort Yates in 1873.
The Standing Rock Sioux Reservation is situated in North and South Dakota. The people of Standing Rock, often called Sioux, are members of the Dakota and Lakota nations. "Dakota" and "Lakota" mean "friends" or "allies." The people of these nations are often called "Sioux", a term that dates back to the seventeenth century when the people were living in the Great Lakes area. The Ojibwa called the Lakota and Dakota "Nadouwesou" meaning "adders." This term, shortened and corrupted by French traders, resulted in retention of the last syllable as "Sioux." There are various Sioux divisions and each has important cultural, linguistic, territorial and political distinctions. -from Standing Rock Sioux website