Too busy killing each other to invent the wheel or even to begin the Bronze Age. Stone age.
They are no more "indigenous" than wild horses or wild hogs, neither of which arrived before Columbus.

Early illiterate stone age migrants from Asia, marching across the frozen Bering Strait during the last ice age. Committed genocide against the Neanderthals, and then began fighting among themselves.

Blessed are the Colt Peacemakers.

Get what you can, while you can, and keep it concealed and quiet forever.

Gutless cowards wait to get on the winning bandwagon. Why not Make America Great Again NOW?
Do your share, get off the sidelines. Summer soldiers and sunshine patriots annoyed Thomas Paine.