The tasins in egypt were the first egyptains,but that does not exactly mean they invented the civlization. There weere two parts of egypt upper and lower egypt. The lower egypt culture seemed to developed sperate of that in the upper egyptain. Upper egyptains were africans such as the gerzen,naquda,badarian. The upper egyptains were the fayyium,merida,and maadi culture.
When narmer came from upper egypt and united upepr and lower egypt under the crown he is shown on the palette amithing what appers to be foreigners probally related to libyans,and drives themout. THe unification brought the upper and lower egyptains toghter so they mixed,which is were you get your mixed population from. If you want to get moreinformation on ancient egypt pre historic times check out aperson naemd shomaka keita. All archeoilogical evidence points to egypt being an africna civlization,not asian,not europe but african.
Most surprising, evidence that early pharaohs ruled in A-Group Nubia was discovered by the Oriental Institute at Qustul, almost at the modern Sudanese border. A cemetery of large tombs contained evidence of wealth and representations of the rulers and their victories. Other representations and monuments could then be identified, and in the process, a lost kingdom, called Ta-Seti or Land of the Bow, was discovered. In fact, the cemetery at Qustul leads directly to the first great royal monuments of Egypt in a progression. Qustul in Nubia could well have been the seat of Egypt's founding dynasty.

Figure 1: The decoration of the Qustul Incense Burner, as restored. A sacrificial procession contains the earliest definite image of a pharaoh with his crown and falcon-label. Oriental Institute Nubian Expedition
there is evidence that the pharoah concept could have come out of nubia,what the egyptains called taseti

http://www.arabia.com/life/article/english/0,11827,40388,00.html nabta could have well been where the ancient egyptains came form to
http://members.xoom.virgilio.it/francescoraf/hesyra/Egyptgallery02.html pictures of the first pharoahs

p. 2. Williams, Bruce, "The Lost Pharaohs of Nubia,"
Archaeology 33/5 September/October 1980 12ff.
You might want to get Ian shaw enclycopedia of egypt who is educated at oxford in egyptology he supports pre histoic kemet coming from the formation of africa.
Idon'tbuy that sphinx thoeries myself,nor that the paws of the sohinx are eroded.
michel hoffman before the pharoahs is another good book