Why might greek city state division be a problem when fighting the persians?​

Many Greek city-states had been alienated from Sparta following the violent  The Persian Empire adopted a divide-and-rule strategy in relation to the Greek ... was to continue fighting the Persian Empire after the Greek victories at the end of the ... Athens and Sparta, and would even bribe politicians to achieve these aims.

Explanation:

the main reason the us senate rejected the treaty of versailles was because "european nations wanted to punish germany"

d(:

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