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Basically in this timeline when the Achaemenids cross the Bosporus strait and march into Thrace, the Thracian tribes bring all of their armies and lands under one ruler and manage to hold the Achaemenids at bay. Eventually they come to some sort of peace deal(perhaps the Thracians give them some towns or something) and the Thracians State continues to exist on the Achaemenid periphery.
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