The Indians were more advanced heir than the sub-Saharan. Their misfortune was to live in climes in which others wanted to live.
I don't know that I agree.
The Plains Indians had not discovered the wheel, had no written language, had not discovered how to domesticate animals and were stone age hunter gatherers. Most of the Central African tribes were well versed in animal husbandry and bred cows and goats as food.
Central American tribes were sophisticated, but the Plains Indians were as primitive as it's possible to be.
As you mentioned, "Indians is a generic term which also applies to all aboriginal Americans, including the Aztec and Maya. Go to Mexico and you will see pyramids both big and small which still stand.
This was done without any diffusion of any type except between their cultures. Sub-Saharan Africans had diffusion for centuries but were unable to exploit.
Those pyramids were built with Egyptian influences. The largest manmade structure was in what you monkeys call sub Sahara. To bad we dont confine ourselves to below the Sahara though.
Walls of Benin - Wikipedia the free encyclopedia
The Walls of Benin City was the world's largest man-made earth structure.
[2] Fred Pearce wrote in New Scientist:
"They extend for some 16,000 kilometres in all, in a mosaic of more than 500 interconnected settlement boundaries. They cover 6,500 square kilometres and were all dug by the
Edo people. In all, they are four times longer than the
Great Wall of China, and consumed a hundred times more material than the
Great Pyramid of Cheops. They took an estimated 150 million hours of digging to construct, and are perhaps the largest single archaeological phenomenon on the planet.