Athens would have been returned to having a Tyrant installed by Persia. No doubt they would have expelled him again and Athens would have continued on its road to eventual democracy, just a bit delayed.
The Battle of Marathon, August/September 490 BC, gave Greece a victory over Persia.
The Persians had brought along the Athenian ex-tyrant Hippias who had been ousted twenty years before, who they intended to have rule Athens for them and keep it quiet. The Athenians would in due course have got rid of Hippias again and gone back to their own ways. So the history of Greece might have just paused for a decade then gone on just the same.
no Persia is in Asia and Greece is in Europe
A lot!! For example they won the war over persia even though they were outnumbered and Persia was a superpower! That broke Persias Power over ancient Greece........
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Macedonia.
Persia had a king, not an emperor. The Persian king Darius I was at home in Persia when the battle of Marathon took place, so he was not killed at Marathon. Darius the Great died of natural causes 14 years after Marathon.
The Greek cities under Persian control in Asia Minor revolted. Then Athens and Eretria assisted them, and Persia decided to punish them to discourage interventions from mainland Greece. When this failed at Marathon, Persia decided to take over mainland Greece to establish an ethnic frontier .....
The name marathon comes from the Battle of Marathon. It was fought between Persia and Athens at Marathon, Greece. After the Greeks defeated the Persians, they sent a runner back to Athens to inform the Greeks of their victory. The distance between Marathon and Athens was around 25 to 26 kilometers. He burst into the assembly hall exclaiming Νενικήκαμεν (We have won!) then collapsed and died from exhaustion. This is just a legend.
Datis and Artaphernes.
persia prevented Sparta and Athens from uniting.
Greece and Persia and Greece won