Rocky Boy's Indian Reservation in the context of Chouteau County, Montana

The Cree are a North American Indigenous people, numbering more than 350,000 in Canada, where they form one of the country's largest First Nations macro-communities. There are numerous Cree peoples and several nations closely related to the Cree, these being the Plains Cree, Woodland Cree, Rocky Cree, Swampy Cree, Moose Cree, and East Cree with the Atikamekw, Innu, and Naskapi being closely related. Also closely related to the Cree are the Oji-Cree and Métis, both nations of mixed heritage, the former with Ojibweg (Chippewa) and the latter with European fur traders. Cree homelands account for a majority of eastern and central Canada, from Eeyou Istchee in the east in what is now Quebec to northern Ontario, much of the Canadian Prairies, and up into British Columbia and the Northwest Territories. Although a majority of Cree live in Canada, there are small communities in the United States, living mostly in Montana where they share Rocky Boy's Indian Reservation with the Ojibwe people.

The Cree are in a variety of treaty relations with the Canadian state. Most notable are the Numbered Treaties which cover a majority of Cree homelands. In Quebec, the East Cree (along with the Inuit of Nunavik) entered into one of the first modern treaties: the James Bay and Northern Quebec Agreement which formalized relations between the province and both Eeyou Istchee and the Nunavik region of Inuit Nunangat. A documented westward migration, over time, has been strongly associated with their roles as traders and hunters in the North American fur trade.

Asiniiwin, translated Rocky Boy or Stone Child, was an important Ojibwe leader who was chief of a band in Montana in the late 19th century and early 20th century. His advocacy for his people helped gain the establishment of what is called Rocky Boy's Indian Reservation in his honor. Formed from part of Fort Assiniboine, which was closed, it is located in Hill and Chouteau counties in north central Montana.