How did Blackfoot pressure affect the Flathead and Kutenai around 1800?

Around 1800, the Blackfoot exerted significant military pressure on the Flathead and Kutenai tribes. As a powerful and aggressive military force on the northwestern Plains, the Blackfoot confederacy forced these groups to withdraw from their home territories on the plains of western Montana.12

Following this displacement, the Flathead and Kutenai resettled in the intermontane valleys of the Rocky Mountains. From these new locations, they continued to conduct occasional buffalo hunts on the Plains, often traveling in the company of other Plateau Indian tribes, such as the Coeur d’Alene and Nez Percé, to mitigate the risks posed by the Blackfoot.1