The takeover of Lower Egypt by Upper Egypt, probably about 3100 B.C., is attested both archaeologically (Cialowicz 2008) and symbolically (via the Narmer Palette, etc.). Thus began the era of a unified Egyptian state that persisted through antiquity, on occasion with different ethnic rulers but remarkably similar customs.
Tectonic influences on settlement and culture are commonly apparent in these early stages of complex cultures. However, I cannot say that I see any such influences in the case of Egypt.
Brewer, D. J., 2005, Ancient Egypt: foundations of a civilization: Pearson-Longman, London