The Price of Perfection

Sparta's military edge rested on slavery. The state was built on the helots — a conquered people who outnumbered their masters by roughly seven to one. To hold them down, Sparta kept its whole society armed and watchful, always braced for revolt.

The cost showed up in what Sparta never made. While Athens produced playwrights, philosophers, and architects, Sparta left behind almost no art, ideas, or buildings worth remembering. A nation tuned entirely for war won its battles and forgot how to do anything else.

Then the spell broke. In 371 BC, at the Battle of Leuctra, the Theban general Epaminondas stacked his strongest troops on one wing in a daring slanted line and smashed the Spartan phalanx head-on. The army no one could beat had finally been beaten — and Sparta's grip on Greece never recovered.