Anyway, Papabear, to your point, Mesopotamia was first populated by Sumerians, who seem related to Elamites and the Harappan civilisation.
Most likely these were all Dravidians -- the Sumerians called themselves Sa-gi-ga or the black headed people
Now, the Dravidians are Caucasians, just not Indo-Europeans (just as Semites are Caucasians but not Indo-Europeans)
So your point about Egyptians being Caucasians (through the AfroAsiatic branch that includes Semites and Berbers), yes, but not to the Indo-European/Aryan branch
I do not disagree with anything you said. I was just positing that the Egyptians and North Africans might be descended from people who migrated there from southwest Asia, rather than being natively African.