The Greek city-states were in constant hostility between themselves. There were brief periods of solidity under foreign invasion, and shifting alliances between groups of cities, but warfare was normal. It took the rise of Macedonia to temporarily tame this, but it reverted to renewed divisions and warfare, eventually controlled by their eventual absorption into the Roman Empire which enforced peace.
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The Ancient Greeks were typically more inclined to kill one another than actually 'unite' as it were. This happened on occasion, most prominently whenever Persia became involved... However you should try to see Ancient Greece as more of a very rough and occasional collaboration of strictly independent political identities. Usually they would unite on grounds of spite - indeed their disunity actually helped the Romans subjugate them.
A few things that contributed to greek unity were thier plays, way of life, and geograpthy
He did it by force - they were not 'united', they were under his control. When Thebes revolted, he destroyed the city and sold its inhabitants into slavery as a warning to the others.
Demosthenes was an Athenian lawyer and public speaker who opposed Philip. He warned the Athenians that Philip was a threat to Greek freedom. he urged all the city-states to join together to fight the Macedonians. The Greeks followed his advice and tried to unite, but it was too late. The Athenians joined with Thebes and a few other city-states. They battle Philip's army, but they were defeated.
three greek city states without colonies were Athens, Sparta, and Knossos
a greek city state is a polis The question was about the alliances of Greek city-states. Don't know the Greek translation, but in English they are referred to as leagues. the alliance between the greek city-states was called Delian League. (weazol)
The Greek city-states in Asia Minor were tricked into revolt by the Greek tyrant of Miletus to protect himself against Persian retaliation for his misconduct.