The Peloponnesian War is presented as the ruinous outcome of political rivalry, personal motives, and the failure of Greek states to establish a closer union. In the essays it serves not as a chronicle of military campaigns, but as a warning: divisions among republics can turn their own power against them and leave them vulnerable to destruction and subjection.

Origins and Political Motives

The account first links the war to the actions of Pericles. It describes him as its original author, while acknowledging several possible motives: personal hostility toward the Megarians, a desire to avoid prosecution over the sculptor Phidias, and accusations that public funds had been spent to win popularity. The essay also attributes his attack on the Samians to resentment arising from a private relationship. These explanations are presented as alternatives or as causes that may have combined, rather than as a single settled motive.

The emphasis falls on the danger of private passions acquiring public force. The essay argues that leaders trusted by a people can invoke public purposes while sacrificing national tranquillity to personal advantage or gratification. Pericles’ role therefore connects individual political ambition and grievance to a conflict whose eventual cost, the account stresses, was borne by his countrymen and the Athenian commonwealth.

From Rivalry to Ruin

The war is described as developing through reversals, interruptions, and renewals before ending in the ruin of the Athenian commonwealth. A second account places the conflict within the failed relations of the Greek republics: after their success against the Persian forces, Athens and Sparta did not use the ensuing peace to strengthen their union. Instead, inflated by victory and renown, they became rivals and then enemies.

That rivalry, in this telling, did more harm than the Greeks had suffered from Xerxes. Their mutual jealousy, fear, hatred, and injuries culminated in the Peloponnesian War; the war in turn ended in the ruin and enslavement of the Athenians, who had begun it. The argument thus gives the conflict a stark political reversal: a people strengthened by resistance to an external enemy falls through antagonism with its former partner.

The Confederacy as a Warning

The essays set the war against the institutional weakness of the Greek confederacy. The Amphictyonic council is introduced as a major association of Greek republics whose members retained independent sovereignty and equal votes. Yet the historical example shows that formal equality and shared institutions did not prevent powerful members from pursuing rival interests or smaller members from becoming dependent. The war between Athens and Sparta is one of the most consequential expressions of that failure to secure durable cooperation.

This history supports a broader argument about political union. A weak government, the essay contends, remains troubled by internal dissension, and those divisions invite further calamities. The Peloponnesian War consequently functions as more than a Greek precedent: it illustrates how rivalries left unchecked can turn a union’s members against one another and bring a republic to ruin. The essays invoke that lesson in support of a closer and more effective union among the American states, while presenting the proposed constitutional system as a remedy to be judged by the public rather than as a guarantee already tested in practice.