There are DNA indications that modern Egyptians have more sub-Saharan (black) ancestry than ancient Egyptians did. Ancient Egyptians seem to have originally been from farther north and east.
Oh OK, stand corrected. Interesting.
Agriculture apparently was first developed in the Mesopotamian region. I could see some ancient farmers spreading out, coming across the fertile Nile, and settling there. There might have been some blacks there, but they would have been wiped out.