I te wā o te Pakanga ā-Iwi, ka heke iho te rerenga o ngā kaimahi hou ki te rohe, ā, he tokomaha i haere ki te Rāwhiti ki te whawhai. I hangaia e ngā Missourians i noho mai e rua nga rārangi o ngā kaimahi, tae atu ki te kaitiaki kāinga. Ahakoa i tū ki te taha o te pakanga, i kitea e ngā rārangi o Colorado i roto i te tūranga tino nui i te tau 1862 i muri i te whakaekenga o te rohe o New Mexico e General Henry Sibley me te kaha o Texan. I whakaarotia te pakanga o Sibley o New Mexico hei whakataki i te whakaekenga o te rohe o Colorado ki te raki ki Fort Laramie, e tapahi ana i ngā rārangi tuku i waenganui i California me te toenga o te Uniana. Ko nga Coloradans, i raro i te mana o te Union Army General Edward Canby me Colonel John P. Slough, Lt. Col. Samuel F. Tappan me Major John M. Sibley, i hinga i waenganui i ngā rārangi tuku e rua i te Battle of Santa Fe.
California me te toenga o te Uniana