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.
Why do you have the Aztec Empire extended into the Chihuahua Desert? That's Chichimeca territory. Why are the Tarascans removed from the map?
Why is Haida Gwaii covering half of BC when the island they're from isn't even on the map?
They penciled in "Olmec Kingdom". That's like me going over to a map of Greece and writing Mycenae.