"Sioux State" is not a nick name for the US state of North Dakota.
"Peace Garden State" is the official nickname of North Dakota as adopted by the state legislature in 1957. Other, unofficial, nicknames for North Dakota are "The Flickertail State" and "The Roughrider State".
North Dakota is called the Sioux state because it's referring to the Dakota Sioux Native Americans before North Dakota was a state.
North Dakota
North Dakota is known as the "Sioux State" to recognize the Sioux or Dakota tribes of North Dakota. North Dakota's official state nickname is "The Peace Garden State".
The flag of the US state of North Dakota is called North Dakota's Flag.
The Sioux mainly came from the extreme east of North and South Dakota, but also Minnesota and Northern Iowa.
It is called the North Dakota Flag because it represents the US state of North Dakota.
The Mandan, Sioux, Chippewa, Hidatsa and Arikara were tribes that lived in North Dakota.
The University of Sioux Falls is located in the state of South Dakota.
Mandan, Arikara, Sioux, Hidasta and Chippewa.
The state of North Dakota is north (or above) the state of South Dakota.
Fargo is the capital of North Dakota; the state shares a border with Canada. Indian tribes in North Dakota include the Chippewa and Sioux.
Minnesota and Iowa. The straight part of South Dakota's eastern border and the part north of it is its border with Minnesota. Then the border goes east to the Big Sioux River and follows it until the Big Sioux River ends, and this is South Dakota's border with Iowa.
Siux Falls, Rapid City, and Aberdeen are all located in the US state of South Dakota.