1. The geography of Greece, with its mountains and coastline, contributed to the development of independent city-states and a sense of liberty among the Greeks. It also pushed the growth of maritime trade and colonization.
2. Athens developed as a center of democracy in the 5th century BCE under Cleisthenes and Pericles. All male citizens could participate directly in the assembly and jury courts.
3. Alexander the Great conquered the Persian Empire and much of Asia from 336-323 BCE through his innovative military tactics. His conquests spread Greek culture and political models across his vast empire.