What was the main factor why egypt was invaded by the Persions?

The factors that pushed the civilization at this point were the annual flooding of the Nile River and the discovery of farming. It was the invasion of the Assyrians that caused Egypt to reunite to fight off foreign invaders.

an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.

probally   a few days after there called