Form 3100 bc to 400 bcwas a successful center of civilization

From 3100 BC to 400 BC Ancient Egypt was a successful center of civilization.

Explanation:

Ancient Egypt was a civilization that developed along the middle and lower reaches of the Nile from about 3150 BC until it was conquered by Alexander the Great in 332 BC. It extended south from the Nile estuary to Jebel Barkal near the fourth cataract.

Egyptian civilization depended on the River Nile. When the rains further south caused the river to overtop its banks and cover much of the land, it would immediately irrigate and fertilize the land. This was of great importance in a country where there is virtually no rain.  

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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