Oh, come on, KJ. You can't separate killing and relocating American Indians from conquering the frontier. Sure, there was the (faulty) idea that the same agricultural practices from the east would work in the arid west. But, the settlers could rarely even occupy the land unless they got rid of the Indians first. A large part of Manifest Destiny was the belief that the white Americans were racially superior and that Indians were heathens who needed to be converted to Christianity. Sound familiar?
I don't disagree with any of this, I think you guys are reading too much into my post.
Edit: Lol! ok fine, I didn't say what I meant to say.