In October 1855, near the
confluence of the
Judith and
Missouri Rivers, the Blackfoot Confederacy signed an agreement to remain at peace with other Native American tribes and with citizens of the United States. The Nakoda Nation, along with the Lakota, Dakota, Mandan, Arikara, Hidatsa, Cheyenne, and Arapaho, had signed the
Treaty of Fort Laramie in 1851 with the United States government in what is now North Dakota. These treaties established the tribes' sacred territories within the continental United States. The Fort Belknap Reservation was established in 1888 in north-central Montana. It comprises a small portion of their vast ancestral territory. Their former territory extended across all of north-central and eastern Montana and portions of western North Dakota. Fort Belknap Reservation was named after
William W. Belknap, the secretary of war in President
Ulysses S. Grant's administration. Belknap was later impeached for corruption. The origins of the name
Aaniiih, (meaning the White Clay People) is unclear. Many believe that they painted themselves with white clay found along the Saskatchewan River for ceremony, like the northern
Arapaho. Early French fur trappers and traders named this tribe
Gros Ventre. Other tribes in the area referred to them as the " Water Falls People". Lacking a common language, they used physical signs to indicate some terms. The sign for waterfall was the passing of the hands over the stomach. The French traders interpreted this as meaning "big belly" and called the Aaniiih the Gros Ventre, meaning "big belly" in the French language. The Nakoda (meaning the Generous Ones) split with the
Yanktonai Sioux in the 17th century. They migrated from the Minnesota woodlands westward onto the northern plains with their allies, the
Plains Cree. The Chippewa called the Nakoda as the Assiniboine people in their language, an Ojibwe word meaning "one who cooks with stones". The Nakoda would heat rocks and put them in rawhide pots to heat water and cook food. The Nakoda peoples live on both the Fort Belknap and Fort Peck Indian Reservations in Montana and on several reserves in
Saskatchewan and
Alberta, Canada, where they are generally known as Stoney. The Aaniiih and Nakoda were nomadic hunters and warriors. They followed the
bison, commonly called buffalo, for seasonal hunting; they made use of all parts of the massive animals, for food, clothing, cord, tools, etc. Their food, clothing, and teepees were all derived from the buffalo. The buffalo was the Indian "staff of life", supporting the nomadic cultures of the Nakoda, Aaniih, and other Plains tribes. The last wild herd of buffalo in the continental United States in the 19th century roamed between the Bear Paw Mountains and the Little Rocky Mountains in the lush Milk River valley of Montana. ==Economy and landholdings==