Siksika Blackfoot. When European explorers travelled west, they most likely met the Siksiká first and assumed all Niitsítapi of the Blackfoot Confederacy were Blackfoot, which is incorrect. The four Niitsítapi nations of the Blackfoot Confederacy are the Siksiká, Káínaa (Kainai or Blood), Aapátohsipikáni (Northern Peigan), and Aamsskáápipikani (South Peigan or Montana Blackfoot). The approximate population of the Siksika Nation, as of 2009, is 6,000 people. (V)