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Why did the Persian Empire Collapse?

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♦Sources :

https://www.history.com/topics/ancien...

https://sites.google.com/a/jeffcoscho...

Olmstead, Albert T. (1948). History of the Persian Empire. University of Chicago Press. ISBN 9780226627779

The Penguin Encyclopedia of Ancient Civilizations, ed. Arthur Cotterell, Penguin Books Ltd., London, 1980, p. 154

Prevas, John. Envy of the Gods: Alexander the Great's Illfated Journey across Asia. Da Capo Press, 2004

Siegfried Lauffer, Alexander der Große. third edition, Dtv, Munich 1993, ISBN 3423042982, p. 114

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