The answer is imperialism
Assimilation through the Dawes Act for Native Americans effectively destroyed native American culture.<span> The Dawes Act also made indigenous individuals American citizens. The ability of Native Americans to make and enact their own laws was eliminated.</span>
I would think it’s A. It was hard to send supplies, no place to permanently stay, sneak attacks all hours, nonstop fighting, not being able to see their family for forever, not knowing when the war was going to be over.