How might the Persian wars have ended if the Spartans had not slowed the Persians at themopylae

The Spartans did not slow the invasion to any real degree. TheGreeks had had a couple of year’s notice of the upcoming invasion,and the Persians advanced slowly over several months. And the Greekplans to defeat the invasion were not dependent on a three-daydelay. The defence of Thermopylai was done to precipitate a navalbattle to cripple the invasion. When the naval battle in the straitnext to Thermopylai failed, the reason for defending the passevaporated.

The fate of the invasion and defence of Greece was decided at thesea battle at Salamis and the land battle at Plataia.