Native peoples of North America are not a civilization gone - Native Peoples have always lived in North America since the beginning of time.
Become aware,that Canada may be "free" but not for First Nations Peoples.
If you imagine an area to live in like "Cowichan Tribes Indian Reserve" or any area native peoples live in, or forced to live in,
there is no room to grow or populate. A reserve is like a wild life reserve.