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.
I think this map tries to apply European notions of borders and nation states where they don't really apply.
It's also wildly inaccurate as it's a fictional map of an uncolonized America in 2015