The Punic Wars (264–146 BC) represent Rome's transformation from a regional Italian power into the dominant force of the western Mediterranean. The three wars stretched over 118 years and cost casualties on a scale that rivaled any conflict in ancient history.

The First Punic War (264–241 BC) began over control of Sicily and required Rome to build a navy essentially from scratch — according to tradition, using a captured Carthaginian warship as a template. Rome's naval victory was ultimately decisive, but only after catastrophic fleet losses in storms that would have broken a less resilient state. Rome's willingness to rebuild fleet after fleet is one of the most striking demonstrations of Roman strategic persistence.

The Second Punic War (218–201 BC) was Hannibal's war. The strategic logic of his Italian campaign was to detach Rome's Italian allies by demonstrating Roman vulnerability; the plan partially worked (several southern Italian states defected) but ultimately failed because most allies held and Rome refused to negotiate. The Roman strategy after Cannae — avoiding pitched battle, wearing down Carthaginian supply, attacking Carthage's Spanish empire — was associated with Quintus Fabius Maximus, whose Fabian approach became the model for attritional warfare.

The Third Punic War (149–146 BC) was less a war than Rome's decision to destroy a city that was no longer a strategic threat. Cato the Elder's repeated declaration — 'Carthage must be destroyed' — has become a shorthand for political obsession. The actual destruction, which involved the killing or enslavement of the entire population and the physical leveling of the city, was a statement of Roman power and perhaps of Roman fear of what a rebuilt Carthage might become.