late edit: DISCLAIMER: The pictured map is not actually a representation of the territories before colonisation. It's a hypothetical map of what countries there might have been had the continent not been colonised, thus all the names and borders are fictional and have never existed.
For good actual maps, check out native-land.ca.
You want a GDP map of pre-contact America?
But seriously: don't call them ancient. That compares them to the ancient people of the old world which they are not. They have a unique history. Call them pre-contact or pre-colonialism or pre-Columbus or something next time
Don't call them people of the old world. That implies the world is only thousands of years old, which it is not.
Bla bla bla words