Meta-exoticism?

The night is late.. and I totally forgot about this assignment. But here is a brief thought.

I have been mourning and pondering what the Native Americans has been violated with the "new America." As mentioned in this quote, "Anxieties about the fate of Native American peoples, their possible assimilation, and their potential extermination flourished during the late nineteenth century because of concerns that extended well beyond indigenous America," the anxiety, again, of the "intruder" or "westerner's" fear of stripping what is Native arises. But then in the following sentence, the fear is turned into some sort of righteousness, that the new nationality or identity is true, and somehow the incorporation or adaption of the natives are purifying the "true Americanism." : "The last two decades of the century were years of increasing immigration, a trend accompanied by fears of "race suicide" and anxiety over increasing numbers of "hyphenated Americans" unable to assimilate into "true Americanism," to use Theodore Roosevelt's phrase"
I wonder instead of focusing so heavily and sensitively around if anything is taken away by the merging of two cultures and people, (forcefully or voluntarily) if there is a meta angle to take on.  Instead of judging if the process of the merging was right or wrong, what if we took a look at, why must've that merging happened. What, ethnographically, drove the puritans to come and claim an already claimed land? What went into that? Is there a moral judging to be done there? Or is even just an honest account possible/