The Greek city-states were able to go back to their usual fighting each other, culminating in the devastating 27-year Peloponnesian War. Further weakened by ongoing warfare, this made them an easy mark for takeover by a rising Macedonia.
With the external threat from Persia gone, they were able to go back to their usual constant warfare with each other. This left the way open for Macedonia to impose control on the weakened city-states.
The Greeks stood their ground and fought for their freedom against the Persians. Their victory caused the Greeks many lives.
They were able to get back to their usual occupation of fighting each other.
The Battle of Thermopylae: The Persians won the Battle of Thermopylae against the Spartans, but it was a Pyrrhic Victory. The Battle of Salamis: This Naval Battle was critically won by the Athenians against the Persians. The Battle of Plataea: This Battle was won by the Alliance of Greek City States against the Persians.
The Greek city-states defeated the Persians in a series of sea and land battles. The Persians agreed to peace and the Greek cities went back to fighting each other with increasing ferocity, using the expanded forces they had used against the Persians.
Because he was Greek.
It removed the Persian attempt to incorporate the Greek city-states into the Persian Empire.
In 490BC when Pheidippedes, a Greek messenger, ran from the Battle of Marathon, to Athens to proclaim the Greek victory over the Persians
The Greek won through superior sea (Salamis) and land (Plataea) tactics.
Greece was strongest when city-states banded together.
The Spartan admiral Eurybiades.
The Persians decided to bring all the Greek cities under control to enforce peace. They invaded in strength ten years later.
The battleground where the Athenians defeated the Persians. The messenger who was sent to deliver the message of victory, collapsed and died.