“Have you read “Pudd’nhead Wilson”? Do you even know the theme of the book? “
No, but I think it is quite safe to assume it has nothing to do with science or biology.
“Perhaps you could point me toward a scientific description of what constitutes being “Black”.”
No, “black” was never a racial classification, so that literature doesn’t exist.
OK. Let me rephrase the question in your terminology. Can you point me toward racial classification definitions in the scientific literature?