Fascinating. Who knows what was capable way back when? The vikings got here before Columbus but there isn't a whole lot of proof. And how did egyptians build those huge pyramids? What about easter island and the statues? And Stonehenge?
I find it a fascinating topic, myself, mulling over what if's. Great thread.
The Vikings had a sea going technology because of Roman and Greek influence. They had traded in Northern Europe for hundred of years and had come in contact with the people of the north. The disadvantage that the sub-Saharan Africans had was that they were isolated from these influences by the Sahara desert. The people of Eurasia, the Eurasian landmass, had a great advantage over all the other peoples of the earth due to the unique characteristics of the continent. The Eurasians developed their societies earlier not because they were mentally or physically superior, but because they were born in the right place.