It is odd, but North American Indians never developed anything past stone arrows, bent wood and woven wicker baskets, and (in places) bark-coated canoes. Large dirt piles, in the few towns that built mounds in their flood plains, were their highest architecture outside of the mud-brick Indian pueblos up the canyon walls in a few places out west.
That’s it.
Mayan, Aztec, Inca all built with large and well-trimmed rock down south. Not everywhere of course, but in many large cities down there with a central religiously-controlled culture.
But up north? Nothing.
In Africa? South of Egypt, there is only ONE “tower” in ONE place across the entire continent. And NOTHING has EVER “come out of Africa” to advance ANY other culture. No invention, no writing, no mathematics, no weapons, no chemistry or physics or astronomy. No agriculture nor business.
it is odd.
If she has any white friends left after that ignorant diatribe, they must be bullying victims or just plain stupid.