The political use of the Ancient River Civilization of Egypt? I don't exactly follow. A civilization cannot have a "political use". However, if we are talking about how Egypt politically affected the world:
When trying to expand its borders, the Egyptians spread their influence to several different lands. They conquered lands stretching from East Africa to Southwest Asia. Afterwards, Egypt was conquered in return by Libyans, Kushites, Assyrians, Persians, Macedonians, Romans, etc..
Hope this helped and good luck! (Love your profile pic!)
