Classical Greece was shaped by migrations into the region starting around 2000 BCE, including the Minoans and Indo-European groups like the Dorians and Ionians. Greece's mountainous geography promoted coastal trade and cultural diffusion but lacked good farmland, leading to Greek and Phoenician colonization across the Mediterranean from 750-550 BCE. Notable city-states like Athens and Sparta developed different political systems, with Athens becoming a direct democracy in the 6th century BCE. The Persian Wars of the 5th century BCE resulted in a Greek victory that increased Athenian power and cultural influence. However, tensions between Athens and Sparta later erupted into the Peloponnesian War, weakening both and allowing Macedon