That’s what Native Americans are, indigenous. They are a genetic population that evolved in the New World. As far as populations worldwide go, they are very distinct and ancient.
In anthropology indigenous means first people to inhabit an area. It has nothing to do with how long they’ve been there.
They may have evolved, but they didn't spontaneously show up in the New World. It's my understanding that they originally came from Asia across the Bearing land bridge. I could be wrong.
No, Indians did not evolve in the New World.
They came from the Asian steppes around 12,000 years ago.