Piikani Nation in the context of "Indian Act"

The Blackfoot Confederacy, Niitsítapi, or Siksikáí'tsitapi (ᖹᒧᐧᒣᑯ, meaning "the people" or "Blackfoot-speaking real people"), is a historic collective name for linguistically related groups that make up the Blackfoot or Blackfeet people: the Siksika ("Blackfoot"), the Kainai ("Many Chiefs") or Blood, and two sections of the Peigan or Piegan or Piikani ("Splotchy Robe") – the Northern Piikani (Aapátohsipikáni) and the Southern Piikani (Amskapi Piikani or Pikuni). Broader definitions include groups such as the Tsúùtínà (Sarcee) and A'aninin (Gros Ventre) who spoke quite different languages but allied with or joined the Blackfoot Confederacy.

Historically, the member peoples of the Confederacy were nomadic bison hunters and trout fishermen, who ranged across large areas of the northern Great Plains of western North America, specifically the semi-arid shortgrass prairie ecological region. They followed the bison herds as they migrated between what are now the United States and Canada, as far north as the Bow River. In the first half of the 18th century, they acquired horses and firearms from white traders and their Cree and Assiniboine go-betweens. The Blackfoot used these to expand their territory at the expense of neighboring tribes.

The Piegan (Blackfeet: ᑯᖿᖹ / Piikáni / ṗiik̇ǔni, Blackfoot pronunciation: [piːkʌ́ni]) are an Algonquian-speaking people from the North American Great Plains. They are the largest of three Blackfeet-speaking groups that make up the Blackfeet Confederacy; the Siksika and Kainai are the others. The Piegan dominated much of the northern Great Plains during the nineteenth century.

After their homelands were divided by the nations of Canada and the United States of America making boundaries between them, the Piegan people were forced to sign treaties with one of those two countries, settle in reservations on one side or the other of the border, and be enrolled in one of two government-like bodies sanctioned by North American nation-states. These two successor groups are the Blackfeet Nation, a federally recognized tribe in northwestern Montana, U.S., and the Piikani Nation, a recognized band government in Alberta, Canada.