North American civilizations existed. All North American tribal civilizations were subsumed by the American civilization and are now dependent on it for their existence as a people. The same can be said for Central and South American civilizations being dependent on European-Christian civilizations, despite the fact that they were significantly more advanced than the ones in North America.
Those aren't different terms.
North American civilizations existed. All North American tribal civilizations were subsumed by the American civilization and are now dependent on it for their existence as a people. The same can be said for Central and South American civilizations being dependent on European-Christian civilizations, despite the fact that they were significantly more advanced than the ones in North America.