Explain how Greece's mountainous, island-studded geography led to independent city-states (poleis) and widespread colonization rather than one unified kingdom.
Greece's geography looks almost designed to keep people apart: steep mountain ranges cut the mainland into isolated pockets, and hundreds of islands are scattered across the Aegean Sea. Unlike Egypt's unified Nile valley, Greece had little large, connected farmland, which made one huge kingdom hard to hold together and made the sea, not roads, the easiest way to travel. Out of this landscape grew the polis (plural poleis): an independent city-state, each with its own government, laws, and army, built around a fortified high point called the acropolis and a central marketplace and gathering space called the agora.
Because Greek geography offered little farmland but easy sea access, many poleis sent settlers to found colonies all around the Mediterranean and Black Sea coasts, from Sicily and southern Italy to Asia Minor (western Turkey today). These colonies spread the Greek language, an alphabet adapted from the Phoenicians around 800 BCE, and Greek culture across a huge area, even though Greece itself never became one unified state. Greeks called themselves Hellenes and recognized a shared culture and language, but their political loyalty stayed local, to their own polis first -- a tension that will matter all through this unit.
Mastery looks like: They can explain how Greek geography favored independent city-states and describe the acropolis and agora's roles within a polis.
Common stumbles: Assuming ancient Greece was a single unified country rather than a collection of independent, often rival city-states.