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In OTL, the Archaemenid Dynasty Persian Empire (from about 550 BCE till Alexander the Great conquered them) was powerful, even conquering Macedonia, and a large area to the north of Persia. And for years Greece and Persia were at war, but Persia eventually began to collapse from the inside out before Alexander came. What I am wondering is what is required for Persia to win a war with Greece. At least they should control Athens and Thebes but controlling all of the Peloponnesian City States (Corinth, Sparta, etc) would be nice.
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