Late-predynastic 'Dynasty 0' proto-states (Scorpion, Narmer) that unified Upper and Lower Egypt.
Protodynastic Egypt (Naqada III / Dynasty 0, c. 3200–3100 BCE) culminated in the unification of Upper and Lower Egypt under Narmer (identified by many scholars with Menes), founding the Early Dynastic Period (Dynasty 1) c. 3100 BCE; it did not end through external conquest but through the political success of its own rulers.
Treats the Naqada III 'Dynasty 0' unification of Upper and Lower Egypt.
Detailed study of the formation of the Egyptian state from the late predynastic.
Primary source — Manetho's king-lists and dynastic framework are essential for understanding the transition from Predynastic to Early Dynastic; Loeb Classical Library vol. 350