Climate changes and/or overgrasing around 8000 BC began to desiccate the pastoral lands of Egypt, eventually forming the Sahara . Early tribal peoples migrated to the Nile River where they developed a settled agricultural economy and more centralized society.
By about 6000 BC, organized agriculture and large building construction had appeared in the Nile Valley. During the Neolithic , several predynastic cultures developed independently in Upper and Lower Egypt . The Badarian culture and the successor Naqada series are generally regarded as precursors to Dynastic Egyptian civilization . The earliest known Lower Egyptian site, Merimda, predates the Badarian by about seven hundred years. Contemporaneous Lower Egyptian communities coexisted with their southern counterparts for more than two thousand years, remaining somewhat culturally separate, but maintaining frequent contact through trade. The earliest known evidence of Egyptian hieroglyphic inscriptions appear during the predynastic period on Naqada III pottery vessels, dated to about 3200 BC.
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