We Aryans never told the Africans they could never build, they had the materials but not the motivation.
Dude, white people walked into black countries, stole their resources and kidnapped their people to sell at fucking market.
As for motivation, you mean protection from weather and the predators that Africa is kinda famous for wasn’t motivation enough? Of course they built. Fucking Google this shit, you short-chained genetic abberation.
Also, they had cities. They had kingdoms. And empires. What they didn’t have was a big market for cannons, until Europe came along and decided that they wanted all that African gold, all those African diamonds, and all those African people. And even then, Europe, as ever, wasn’t sharing.