First off, the "Native Americans" are as native to this country as the descendants of colonial Europeans. It is a proven historical fact that the Indian tribes migrated from Siberia to North America via the Trans-Siberian Land Bridge that allowed people to walk from modern day Russian to modern day Alaska. Besides, the term "native" means "native-born", which means you were born in that country.
In that sense, I am a native-born American. You are likely a native-born American. There are hundreds of millions of native-born Americans.
Furthermore, the American Indians themselves are guilty of a genocide. When they immigrated, this continent was occupied by another culture which no longer exists, although human skeletons pre-dating even the oldest American Indian skeleton have been found - the newest of which shares a similar carbon dating to the oldest American Indian skeleton.
Of course, you never here about THAT genocide in school. It's not politically correct to show that the "victimized" American Indians also have a genocidal history.