The Oromo were colonised during the last quarter of the nineteenth century by a black African nation - Abyssinia - with the help of the European colonial powers of the day. During the same period, of course, the Somalis, Kenyans, Sudanese and others were colonised by European powers. The fact that the Oromo were colonised by black African nation makes their case quite special.
Wadad makes a compelling argument. Then again, the opposition could always point out the relative amount of racial continuity in West Eurasia. Personally, I consider East Africa as black as Mali. I'm just playing devil's advocate.
Africa's cultural areas are not just "Black" Africa and everyone else. It is much more complicated than that. Ethiopia has a very distinct culture and tradition from the rest of the continent. It is very much like a micro-continent. It had societies which ranged from feudal/medieval to stone age. East Africa as "black" as Mali...Mali is a relatively recent creation by the Western powers. I didn't realize Mali was a distinct unit culturally from say Burkina Faso or western Niger.
Well, much of the southern coast of Europe was influenced by the Levant/Middle East, especially in writing. Is there anyone who disputes this?