My primary contention with your original comment is the framing of actions as white supremacists or racist. Neither white supremacy nor racism were driving for

My primary contention with your original comment is the framing of actions as white supremacists or racist. Neither white supremacy nor racism were driving forces in the founding or expansion of the US. History would have played out the same way even if all humans were purple. The native populations were weak in population and militarily. The persistent push of settlers was bound to meet resistance in the form of violence. Before the US military was involved in securing the west, some tribes had already been slaughtering settlers to protect their territory the same as they would for invading tribes. It isn't like the US government just decided to wipe out a peaceful people. It was literally war. Along with war comes the denigration of "the other" to make convincing your army to kill them easier. Skin color just happened to be an easily identifiable feature of "the other" that was used in that denigration. If we were all purple it would have been some other feature to identify the other. You can see this in the histories of wars where both sides were the same race. The history of the US is no different than every other empire that has existed.