More on who came first:

"Nubia is Egypt's African ancestor. What linked Ancient Egypt to the rest of the North African cultures is this strong tie with the Nubian pastoral nomadic lifestyle...Thus, not only did Nubia have a prominent role in the origin of Ancient Egypt, it was also a key area for the origin of the entire African pastoral tradition."

--Gatto, Maria. The Nubian Pastoral Culture as Link Between Egypt and Africa, Oxford Press, 2009, p. 26.