Why did not a single city of Hellas manage to unite the whole country under its rule, and the Macedonians managed to do it?

Philip the Macedonian had 5-10 times more military forces than Athens or Thebes, but much less than the combined military resources of the policies of Hellas. However, Philip was a king and could gather all his forces together, and the Greeks were too jealous of each other and did not want to unite. Philip, in contrast to Xerxes, had a good command of the Roman wisdom: “Divide and rule!”

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