The Peloponnesian War Divides Greece

The event

The long and grinding war between Athens and Sparta, and their respective alliances, consumed nearly three decades and left the once-flourishing Greek city-states militarily and economically drained. Sparta emerged the nominal victor, but no single power was left strong enough to unify or defend Greece as a whole.

This exhaustion opens the door for a rising power on Greece's northern frontier: Macedon, whose kings would soon unite the fractured Greek world by force rather than persuasion. It is a pattern that recurs throughout history — the great turning points often arrive not at an empire's strongest moment, but at its point of collapse.