Why did the Persian Empire Collapse?

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Why did the Persian Empire Collapse?
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♦Sources :
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Olmstead, Albert T. (1948). History of the Persian Empire. University of Chicago Press. ISBN 978-0-226-62777-9
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 Ill-fated Journey across Asia. Da Capo Press, 2004
Siegfried Lauffer, Alexander der Große. third edition, Dtv, Munich 1993, ISBN 3-423-04298-2, p. 114
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