''Northern Afrika is comprised of many ethnic groups. Of course the indigenous North Afrikans are black but through the course of time Asiatics, Arabs, and Caucasians established "trading posts" on the outskirts of the Northern Afrikan coast''
The Northern African coast has always been caucasoid or Medditerean. Remeber that the term caucasoid does not mean white and can refer to many types of people such as Arabs,Hindus,Berbers,and other types. You are correct that there is a indigenous black elements in both Magreb and Egypt,but this does not mean that lighter types that live in this region are automatically invaders. The Arab migration into Egypt and Magreb was so little that it is doubtful they left much of a trace. What was larger was the Greco-Roman migration into Northern Africa,but this only effectewd certain areas. In Egypt there was mandates in Alexzandria banning Egyptians from mxing with Greeks in naucratis and Alexzandria. Greco-Romans only established trading cities as far as Middle Egypt,but never ventured into Waset or Thebes. The Thebean Egyptians was much too rebellious that they never settled this region.
By the way,the Egyptians depicted Tamahou Libyans in their artowrk,and also depicted Technou people as being dark brown with tightly curled hair.