No treaties, whether between civilized nations or not, can ever be regarded as binding in perpetuity; with changing conditions, circumstances may arise which render it not only expedient, but imperative and honorable, to abrogate them.
Necessity of the Conquest.
Whether the whites won the land by treaty, by armed conquest, or, as was actually the case, by a mixture of both, mattered comparatively little so long as the land was won.

It was all-important that it should be won, for the benefit of civilization and in the interests of mankind.

It is indeed a warped, perverse, and silly morality which would forbid a course of conquest that has turned whole continents into the seats of mighty and flourishing civilized nations.

All men of sane and wholesome thought must dismiss with impatient contempt the plea that these continents should be reserved for the use of scattered savage tribes, whose life was but a few degrees less meaningless, squalid, and ferocious than that of the wild beasts with whom they held joint ownership.

It is as idle to apply to savages the rules of international morality which obtain between stable and cultured communities, as it would be to judge the fifth-century English conquest of Britain by the standards of today.