I'll pose this question to you as I have to others....how did the Egyptians lose their civilization? What exactly comprises a culture of support?
Again, you are thinking in terms of spookism. What is the Hermetic Law of Polarity? Cause and Effect? Of Rhythm? What is the first and second law of thermodynamics? When you know these LAWS of the Universe you will have answered your own questions.
If you build an empire based on colonialism and murder, what do you expect given the law of Rhythm? I suggest that one do some serious study on Nile Valley civilization and stop reading internet articles on it. We need to buy the thick books and read them. Also, learn how to read Mdw Ntr and read their testimonies.