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.

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

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