Why was the battle of Thermopylae considered to be a turning point of the Persian War?

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The Battle of Thermopylae took place at Thermopylae. Greeks were able to hold off Persian invaders for 3 days until a Greek traitor showed the Persians a way over the mountains. ... Xerxes' defeat was a turning point in history because it ensured that Greek culture could continue to thrive in the west.

it allows businesses to raise prices on basic goods. it allows consumers to spend more money on products. it increases government revenue to fund public projects. it provides more money for government assistance programs.

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