How did the battle of Thermopylae affect Greece?

While the Battle of Thermopylae was technically a defeat for the Greek coalition, it was also a conquest. It marked the beginning of several important Greek victories against the Persians and represented a morale shift among the Greeks. ... By its very nature, the Persian Empire was expansionistic.

Explanation: This is from edg i doubled check good luck!

The Persian were able to organize and control their empires because they were willing to delegate authority and to pay some attention to the desires of the people they conquered. For them, hearing what are the wants and needs of the people are the most important. Hope this answers the question.