If you want to talk about power of course those who have the most power will have the most influence. That is how native lands were taken with many of them killed, raped, and displaced, by physical force and deceptive coercion.
But this does not make it moral nor just. If I am going to justify my actions because I can get away with it, and maybe I will in a sense in this world, then I'm quite the evil bastard deserving of all the karma coming to me.
What's sad is even when we think we are getting away with something we are really just cheating ourselves of a much more sublime experience. But that's another issue.
The truth is the truth. And the truth is the natives got a bad lot and from a moral perspective none us here are here legally.
But I do believe most of the natives here would have allowed us to stay anyway if we were willing to be helpful and peaceful. And that is the spirit we should have in kind when considering anyone wanting to immigrate here.
Freedom of movement is a good given right. Who are we to disallow it? The only exception I would make for this is if someone presents a real (not theoretically contrived) danger.
And the truth of the matter is most people coming here just want a better life. That's it.