History
Hellenic civilization reached the peak of its power duing the 5th century BC. In 478 BC, following the defeat of the Persian invasion, Athens assumed leadership of an alliance known as the Delian League, which would later come to be known as the Athenian Empire. Sparta, the other great power in Greece and leader of the Peloponnesian League, feared the growth of Athenian power and sparred with Athens throughout the middle of the century. Finally, the two sides fought in the Peloponnesian War, from 431 BC-404 BC., which involved virtually every state in Greece, including colonies in Asia, Italy, and Sicily. The war ended in the decisive defeat of the Athenian Empire.
Sparta made an attempt to assure her own supremacy in the Aegean, but in the end Persia managed to recover the Greek cities on the coast of Asia Minor, and starting with the King's Peace in 386 BC even began dictating affairs on the mainland. Athens built up a second confederacy and recovered a position equal to Sparta's, and then Thebes became for a moment the supreme power under Epaminondas. After his death, Greece was left weak and exhausted by continual warfare, leading to its conquest by Macedonia.
The usual periodization practiced by modern historians is to see the death of Alexander the Great in 323 BC as dividing the Hellenic period from the Hellenistic. The shift from "Hellenic" to "Hellenistic" represents the shift from a culture dominated by ethnic Greeks, however scattered geographically, to a culture dominated by Greek-speakers of whatever ethnicity, and from the political dominance of the city-state to that of larger monarchies.
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