If anyone has a claim of being here first it would be the tribes at the Tierra del Fuego in Argentina. They were the first till driven south by new invaders who were driven out by new invaders who were driven out by new invaders.
Had the European tribes not found the New World the dominant tribe of the High Plains might now be the Eskimo, driven out of the arctic by new invaders from East Russia or China.
Good information. Thank you for sharing.