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In page Ancient Greece:

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The city-states within Greece formed themselves into two leagues; the Achaean League (including Corinth and Argos)[10][11] and the Aetolian League (including Sparta and Athens).[citation needed] For much of the period until the Roman conquest, these leagues were at war, often participating in the conflicts between the Diadochi (the successor states to Alexander's empire).[citation needed]