In They Came Before Columbus, we see clearly the unmistakable face and handprint of black Africans in pre-Columbian America, and their overwhelming impact on the civilizations they encountered.
The book deals mostly with his claims of African origin of Mesoamerican culture in the Western Hemisphere, but among other things also writing that the kings of the 25th Dynasty of Egypt were Nubians.
Early America Revisited is a vigorous defense and amplification of Ivan Van Sertima's classic work, They Came Before Columbus. The book makes a carefully balanced case for an African presence in America before Columbus' voyages.