When Was The Nile Valley Civilization In Existence?
The Nile Valley Civilization existed from 5000BC when the Anu people first settled the Nile Valley until 332 BCE when the Nile Valley Civilization fell to the Greeks under Alexander with the conquest of Egypt.
Period When The Nile Valley Civilization Was In Existence
The beginnings of when the Nile Valley Civilization was in existence can be traced to about 5000BC when the Anu people first settled the Nile Valley.
The next stage in the development of the Nile Valley Civilization is when the Anu progressed to build the Ta-Seti Culture which is the oldest Nile Valley Civilization circa 3 800BC with a Proto-Dynastic Culture.
When in 3 400BC Narmer(Menes), the first King Egypt unified upper and lower Egypt this marked the beginning of the Dynastic Period of Ancient Egypt with the Old Kingdom.
From 3 400 BC the Nile Valley Civilization was prosperous until 332 BCE when Ancient Egypt was conquered by the Greeks under Alexander.
Conclusion
Based on the events of the period between when the Nile Valley was first settled by the Anu from 5000BC until 332BCE when the Nile Valley Civilization fell to Greece with the conquest of Egypt, it can be said the Nile Valley Civilization was in existence from when the Nile Valley was first settled in 5000BC to 332BCE when the Nile Valley Civilization was conquered by Greece.