english 11 Change the history or help change the world

If I were able to go into any time period I wanted to at any time, when ever i wanted, and to change the coarse of the future, i would go to right before the contact between the natives and the whites, and either tell the hard way, that they can't have our land, or share it, because i know english, and i think part of my own language still they'll know i'm blood, they would have to, i look like them, i have their genes. but ya just before the contact and warn everybody, so we wouldn't have to go through all the residential schools that hurt our people and lost our language, and that way we would learn to take a stand for whats important to us.