The Sioux are Native American

Native Americans in the United States

Native Americans in the United States are the indigenous peoples in North America within the boundaries of the present-day continental United States, parts of Alaska, and the island state of Hawaii. They are composed of numerous, distinct tribes, states, and ethnic groups, many of which survive as...

 and First Nations

First Nations

First Nations is a term that collectively refers to various Aboriginal peoples in Canada who are neither Inuit nor Métis. There are currently over 630 recognised First Nations governments or bands spread across Canada, roughly half of which are in the provinces of Ontario and British Columbia. The...

 people in North America. The term can refer to any ethnic group within the Great Sioux Nation

Great Sioux Nation

The Great Sioux Nation is a general term sometimes applied to the Sioux. The Great Sioux Nation is divided into three linguistically and regionally based groups and several subgroups:# Lakota...

  or any of the nation's many language dialects. The Sioux comprise three major divisions based on Siouan dialect and subculture:

• Isáŋyathi or Isáŋathi ("Knife," originating from the name of a lake in present-day Minnesota
  Minnesota
  Minnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
  
  ): residing in the extreme east of the Dakotas, Minnesota and northern Iowa
  Iowa
  Iowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...
  
  , and are often referred to as the Santee or Eastern Dakota.

• Iháŋktȟuŋwaŋ and Iháŋktȟuŋwaŋna ("Village-at-the-end" and "little village-at-the-end"): residing in the Minnesota River
  Minnesota River
  The Minnesota River is a tributary of the Mississippi River, approximately 332 miles long, in the U.S. state of Minnesota. It drains a watershed of nearly , in Minnesota and about in South Dakota and Iowa....
  
   area, they are considered to be the middle Sioux, and are often referred to as the Yankton and the Yanktonai, or, collectively, as the Wičhíyena (endonym) or the Western Dakota (and have been erroneously classified as “Nakota
  Nakota
  The term Nakota is the endonym used by the native peoples of North America who usually go by the name of Assiniboine , in the United States, and of Stoney, in Canada....
  
  ”) .

• Thítȟuŋwaŋ or Teton (uncertain, perhaps "Dwellers on the Prairie"; this name is archaic among the natives, who prefer to call themselves Lakȟóta): the westernmost Sioux, known for their hunting and warrior culture, are often referred to as the Lakota.

Today, the Sioux maintain many separate tribal governments scattered across several reservations, communities, and reserves in the Dakotas, Nebraska

Nebraska

Nebraska is a state on the Great Plains of the Midwestern United States. The state's capital is Lincoln and its largest city is Omaha, on the Missouri River....

, Minnesota, and Montana in the United States; and Manitoba

Manitoba

Manitoba is a Canadian prairie province with an area of . The province has over 110,000 lakes and has a largely continental climate because of its flat topography. Agriculture, mostly concentrated in the fertile southern and western parts of the province, is vital to the province's economy; other...

 and southern Saskatchewan

Saskatchewan

Saskatchewan is a prairie province in Canada, which has an area of . Saskatchewan is bordered on the west by Alberta, on the north by the Northwest Territories, on the east by Manitoba, and on the south by the U.S. states of Montana and North Dakota....

 in Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

.
The name "Sioux" is an abbreviated form of Nadouessioux borrowed into Canadian French

Canadian French

Canadian French is an umbrella term referring to the varieties of French spoken in Canada. French is the mother tongue of nearly seven million Canadians, a figure constituting roughly 22% of the national population. At the federal level it has co-official status alongside English...

 from Nadoüessioüak from the early Odawa exonym: naadowesiwag "Sioux".