Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Gabas da rarrabuwa, sabon yankin ya haɗa da ɓangaren yammacin yankin Kansas, da kuma wasu daga yankin kudu maso yammacin Nebraska, da kuma karamin yanki na yankin arewa maso gabashin New Mexico. A gefen yammacin rabuwa, yankin ya haɗa da yawancin yankin gabashin Utah, wanda Ute da Shoshoni ke sarrafawa sosai. Yankin Gabas na Gabas sun kasance da yawa daga Cheyenne da Arapaho, da kuma Pawnee, Comanche da Kiowa. A cikin 1861, kwanaki goma kafin kafa yankin, Arapaho da Cheyenne sun yarda da Amurka don ba da yawancin yankunansu na filayen zuwa fararen fata amma an ba su izinin zama a cikin manyan yankunansu na gargajiya, muddin za su iya jure wa mazauna kusa da sansanonin su. A karshen yakin basasar Amurka a 1865, an kawar da kasancewar 'yan asalin Amurka daga Babban Filayen.  Tambaya: Waɗanne yankuna aka samu zuwa gabas?
Yankin yammacin Kansas Territory, da kuma wasu daga yankin kudu maso yammacin Nebraska, da kuma karamin yanki na arewa maso gabashin New Mexico Territory