The Megarian Decree was a significant economic sanction imposed by Athens against the city-state of Megara during the early stages of the Peloponnesian War. This decree prohibited Megarian merchants from trading in Athenian markets and was part of the growing tensions between Athens and Sparta, reflecting Athens' imperial ambitions and its willingness to use economic power to assert dominance over rival city-states. The decree contributed to the escalation of conflict leading up to the Peloponnesian War.
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