In Federalist No. 12, the Second Punic War is presented as evidence that commercial prosperity does not guarantee a republic’s peaceful conduct. Carthage, though a commercial republic, began the conflict; Hannibal carried its arms into the heart of Italy and to the gates of Rome before Scipio defeated him in Carthaginian territory and brought about the commonwealth’s conquest. The war’s place in the argument is pointed: commerce had not abolished the appetite for power, ambition, or military expansion.

The War as a Counterexample

Publius invokes the war while challenging the idea that commercial societies are less prone to conflict. He asks whether commerce has done anything more than change the objects of war, and whether the love of wealth can be as domineering and enterprising as the pursuit of power or glory. The example of Carthage answers those questions through action rather than abstraction: commercial character did not prevent the republic from becoming an aggressor.

The comparison also distinguishes commercial republics from peaceful ones. Athens and Carthage are identified as commercial republics, yet republics more generally—including Sparta and Rome—had engaged in offensive and defensive wars as often as neighboring monarchies. Carthage makes the argument especially forcefully because its commercial identity coexists with the opening aggression of a war that ended in its own destruction.

The Campaign and Reversal

Hannibal carried Carthage’s arms deep into Italy, reaching the gates of Rome. The account then turns the campaign around: Scipio defeated Hannibal in the territories of Carthage, and that victory led to the conquest of the commonwealth. The movement from an invasion of Italy to defeat on Carthaginian ground gives the example its stark reversal, while the outcome makes clear that the republic’s commercial character offered no safeguard against the consequences of war.

The passage does not supply a detailed chronology or a fuller account of the campaign. Its focus is the political lesson drawn from the sequence it does provide: Carthage initiated the very conflict that culminated in its destruction. The war is therefore not treated as a detached military history but as a concise historical test of the claim that commercial interests reliably restrain states.

Place in the Federalist Argument

Carthage is one example in a series that broadens the challenge beyond a single war. Publius also points to Venice’s wars of ambition and to the Dutch provinces’ contests with England for command of the sea and their persistent opposition to Louis XIV. Together, these cases counter the expectation that commerce replaces older causes of conflict; it can instead furnish new incentives for struggles over wealth, power, and dominion.

The Second Punic War’s decisive significance in this discussion lies in the contrast between Carthage’s commercial standing and its conduct as an aggressor. Its defeat supplies the consequence as well as the warning: a republic’s economic character does not in itself prevent war, and the ambition that launches conflict may end by destroying the political community that indulges it.