Answer by
LeheckaG (1826)
"Niitsítapi", "Original people", or "Blackfoot Confederacy"
consists of:
In Montana, United States of America:
"Aamsskáápipikani", "Blackfeet", or South Piegan,
In Alberta, Canada:
"Aapátohsipikáni", or North Peigan;
"Káínaa", "Blood", or Kainai Nation;
"Siksikáwa", "Blackfoot people", or Siksika Nation.
Their "Blackfoot" name came from the color of their dyed or painted black moccasins,
possibly after blackening due to ashes from fires.