It was a mistake to welcome the Americans to Nez Perce land
Erosion helps it move from place to place and deposition drops it
A. - yes, you need to feed the empire!
B. - yes, you need to defend the empire!
C. - yes, you need to govern the empire!
D. - no, this would actually be detrimental to the empire, revolts would be rather bad than good for it.