Second Macedonian War

The Second Macedonian War is invoked in the Federalist essays as part of a cautionary history of the Achaean confederacy: a league weakened by internal division first sought aid from Macedon and then, against Macedonian power, turned to Rome. The war defeated Philip and Macedon, but the essay’s larger argument is that military victory did not secure Greek independence; foreign intervention helped expose the league to manipulation and eventual ruin.

Background: A League Reassembled

The Achaeans had revived their confederacy after Macedonian power and internal upheaval had broken earlier Greek unity. As cities found opportunities to remove their tyrants, they reunited, and the league spread through much of the Peloponnese. A broader Greek coalition seemed possible, but rivalry and envy in Sparta and Athens checked that prospect. The Achaeans then sought the support of the kings of Egypt and Syria, Macedon’s rivals.

That alignment was undone when Cleomenes, king of Sparta, attacked the Achaeans. His ambition and influence with the Egyptian and Syrian rulers helped bring about a breach of their commitments to the league. The Achaeans faced a choice between submitting to Cleomenes and asking their former oppressor, Macedon, for assistance; they chose the latter. Macedonian forces defeated Cleomenes, but the victory left the Achaeans dependent on the power they had hoped merely to enlist.

From Macedonian Aid to Roman Intervention

The account stresses the cost of that first appeal: a victorious and powerful ally proved to be another name for a master. The Achaeans’ compliance secured only permission to continue exercising their own laws. Under Philip, Macedonian tyranny provoked renewed combinations among the Greeks. Although the Achaeans were weakened by internal dissension and the departure of Messene, they joined with the Aetolians and Athenians in resisting him.

Finding themselves unequal to the struggle even with those allies, the Greeks again resorted to foreign arms, this time inviting Rome. Rome eagerly accepted the opportunity to intervene. Philip was defeated and Macedon subdued, an outcome that ended the immediate Macedonian threat but placed the league within the reach of a more powerful outside actor. The essay presents the appeal to Rome not as a secure solution, but as a dangerous expedient whose consequences extended beyond the war itself.

Victory and the Dissolution of the League

After Macedon’s defeat, dissensions returned among the league’s members. The essay accuses Rome of fostering these divisions and describes Callicrates and other popular leaders as instruments in drawing their fellow Greeks away from the union. Rome had proclaimed universal liberty in Greece; it then appealed to the members’ pride by representing the league as an infringement on their sovereignty. The language of liberation thus became, in the essay’s telling, a means of loosening the bonds of collective action.

The Achaean union was eventually torn apart, leaving such weakness and confusion that Rome could complete by force what its political tactics had begun. The account connects the Macedonian wars to this later collapse without treating the defeat of Philip as the league’s final liberation: the intervention that helped defeat Macedon also gave Rome an opening to divide its former allies and bring Achaia under its power.

Political Meaning in the Federalist Argument

The Second Macedonian War belongs to a broader historical argument against assuming that neighboring states will remain peaceful or united without an effective common government. The Federalist essays use the Achaean experience to illustrate how domestic rivalries, the pursuit of separate interests, and recourse to powerful external allies can turn an alliance into dependence. Macedon first acted as an ally against Cleomenes and then as a force the Greeks resisted; Rome entered as the requested counterweight and ultimately exploited the league’s divisions.

This example supports the essays’ claim that confederacies are especially vulnerable to disorder among their members. The historical narrative does not portray the Greek league’s ruin as the simple result of one battlefield defeat. It traces a chain of choices and reversals: reunion, rivalry, external appeals, renewed conflict, and political division. In that sequence, the defeat of Macedon is a hinge rather than a resolution, demonstrating how a military success can leave a confederacy more exposed when its unity depends on powers it cannot control.