Even if Europeans had never come to North America, the idyllic aboriginal lifestyle of the Native Americans was doomed.
It may have taken another hundred years, but eventually, internal wars or invasion by other foreign populations would have forced change upon them - almost none of it good.
I'm about a third Native American myself, and my birth certificate says that I'm negro, but I don't sit and ponder the worst aspects of this culture and its history on every national holiday. In fact, I've led a pretty good life, compared to what it might have been, had my white ancestors never set foot upon this continent.
What's so idyllic about living a lifestyle that is barely at a subsistence level? Being under the constant threat of starvation should the buffalo fail to show up in the tribe's hunting grounds doesn't seem to be a very idyllic way to live.
In her book The Discovery of Freedom: Man's Struggle Against Authority (New York: Day, 1943), Rose Wilder Lane blamed the extreme poverty of the American Indians on the "communist" lifestyle practiced by most of their tribes.
Great comment—and LOVE your tagline!