Yeah? All humans are savages. I literally said in my comment. If you gave guns to the ancient romans they would also use it to shoot the shit out of eachother. Now, a much better idea would be to go back and tell them them how to defend themselves from the invaders. Also with the power you could get from knowing the future it might be better to do something political like establishing a sort of native american united states in which natives have to respect other natives’ rights and the whole of america is also protected federally under non-natives. They already had their own politics you would just need to tweak it so the british dont steamroll over them.