The video speaks on said subject using the scholarship of W.E.B. DuBois. The book called: The Gift of Black Folks, the Negroes in the making of America. Chapter 1: The Black Explorers
The BOOK: The Gift of Black Folks, the Negroes in the making of America.
https://babel.hathitrust.org/cgi/pt?id=wu.89058593310;view=1up;seq=54
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