Development is a nebulous term. African societies weren't building oceanic armadas or smelting steel but they were making huge advances in mathematics and physics. Some African societies were larger and wealthier than contemporary European ones. But the western yardstick is to measure the development of a society by how many bombs and iPhones it produces per second. Same goes for pre-columbus American civilizations. South American societies were engaged in full-scale hydrological engineering and advanced animal husbandry and selective agriculture exceeding European development. North American societies were governing massive tracts of land and creating self-sustaining food forest ecosystems.