I wouldn't call Browns book as a full perspective at all. In reality it's pretty biased.I've also debated posting to this thread, but here we are.
It seems that some of us are stuck in a bit of the perspective we learned early on. I think it is worthwhile recognizing that there are additional perspectives worth considering.
Some/many of the treaties from the late 1800's were not signed or joined voluntarily by the Tribes. They were forced and coerced into new terms by the US Government which was not upholding previous treaty terms. The US Government was not providing the housing, food, or other means set forth in the initial mid-century treaties. The US Government also attacked peaceful groups and other tribes for various reasons, some of which resulted in retaliation by Natives which the Government used to deny treaty provisions.
I'm not saying one perspective is completely right or wrong, just that the truth probably isn't as simple as some of us initially were taught. This post is a drastic oversimplification of the situation, but if you want the full perspective then check out "Bury My Heart at Wounded Knee."
What happened between the Native Americans and Europeans after first contact was unfortunate, but mostly inevitable. It's what happens when a modern industrial culture comes in contact with one still more or less in the stone age. What was wrong was the blatant racism of the US government when it came to the reservation system and the various schemes foisted on the Tribes ever since. The reservation system in and of itself is racist and needs to be done away with. It's also incidentally the cause of most of the problems NA face today.