You're taking a crime that was done to multiple nations and millions of people and trying to turn it into an analogy in a family's personal history, which isn't right; it's nowhere near in the same scale.

The facts are that the colonists / invaders genocided and displaced the original inhabitants of a continent and moved the survivors into reservations, probably to avoid it going down history as racially motivated genocide entirely.

Sure, you didn't do it, your ancestors probably didn't have anything to with it (or the slave trade for that matter), but that doesn't mean you shouldn't fight for other people's rights. They still suffer under what happened a hundred-and-then-some years ago, they are a people whose country was taken from them, whose culture was (attempted to be) erased, and who today what little they got as a consolation has also been attempted to be taken from them because said consolation actually did have some value.

Your analogy is wrong, oversimplified and trivializing the issue.