The ability of the Greek city-states to put aside (temporarily) their usual warfare between themselves and combine against the Persian invasions.
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The superiority of Greek naval performance.
The superiority of the Greek armoured soldier over the more lightly armoured Persian troops.
The generally superior Greek strategy and tactics.
The fact that the Greeks were fighting for their own land and property and their accompanying tenacity, as opposed to the Persians fighting because they were told to.
The Greeks were on interior lines of supply (ie their own local supply) while the Persians had to transport and protect supplies to their army over hostile territory.
