Understanding International Peace Systems: Models from Pax Romana to Pacifism

Throughout history, humanity has sought different ways to achieve and maintain peace between nations. From the overwhelming might of empires to the complete rejection of violence, international peace systems have taken many forms. Understanding these models helps us see how nations have tried to prevent war and what each approach reveals about power, security, and human nature. Let’s explore four major approaches that have shaped how the world thinks about peace.

Peace through dominance: the hegemonic model 🔗

The most ancient approach to international peace is simple: let one power become so strong that no one dares challenge it. The Pax Romana, spanning roughly 200 years from 27 BC to 180 AD, stands as history’s prime example. During this period, Roman military supremacy created relative stability across the Mediterranean world, though it still featured internal revolts and border conflicts.

This model operates on a straightforward principle: peace exists not as the absence of war, but as the inability of others to resist. The Romans themselves understood peace this way-as a condition where all opponents had been beaten down and lost their capacity to fight. Emperor Augustus skillfully promoted this vision, convincing Romans that prosperity without warfare served the empire better than risky military campaigns.

The Pax Romana proved so influential that historians coined similar terms for other periods of hegemonic peace: Pax Britannica for the British Empire’s dominance in the 19th century, and Pax Americana for the post-World War II era. These systems share a common feature-they rely on overwhelming power concentrated in one state or empire to enforce order and suppress major conflicts.

The price of hegemonic peace 🔗

This model raises difficult questions about the nature of peace itself. When the Roman historian Tacitus criticized what he called creating devastation and calling it peace, he highlighted the moral ambiguity at the system’s heart. Hegemonic peace often means stability for some at the cost of freedom for others. It requires constant military presence, suppression of dissent, and the imposition of the dominant power’s will on subject peoples.

Peace through equilibrium: balance of power 🔗

A completely different approach emerged in Europe after the Westphalian system of 1648: achieving peace by ensuring no single state could dominate all others. The balance of power theory suggests that when power is distributed among several states, they check each other’s ambitions through defensive coalitions and strategic alliances.

This system worked like a seesaw: when one nation grew too powerful, others would band together to restore equilibrium. Britain famously played the role of “balancer” in 18th and 19th century Europe, throwing its weight behind whichever side was weaker to prevent any single power from controlling the continent. The goal wasn’t to eliminate conflict entirely, but to prevent any one nation from achieving the overwhelming dominance that characterized hegemonic systems.

The nuclear age: from balance of power to balance of terror 🔗

The atomic bomb fundamentally transformed the balance of power concept. During the Cold War, the phrase “balance of terror” emerged to describe the new reality: peace maintained not through military equilibrium but through mutual fear of total annihilation. Canadian diplomat Lester Pearson captured this shift in 1955, declaring that “the balance of terror has succeeded the balance of power.”

The doctrine of Mutually Assured Destruction, or MAD, embodied this precarious stability. Both superpowers possessed enough nuclear weapons to destroy each other many times over, creating a deadly paradox: the very weapons capable of ending civilization became instruments of its preservation. As long as both sides knew that any nuclear attack would trigger devastating retaliation, neither dared to strike first.

This system created what scholars call a “nuclear peace”-the United States and Soviet Union never fought directly, despite decades of tension. Yet this stability came with constant anxiety. The threat of accidental war, miscalculation, or technical failure made the balance of terror inherently unstable, earning it the description “delicate” from strategist Albert Wohlstetter.

Peace through reduction: arms control and stabilization 🔗

Recognizing the dangers of unchecked military buildup, a third approach sought to establish peace by gradually reducing the means of warfare. The Hague Peace Conference of 1899 marked a pioneering attempt at this approach, bringing together 26 nations to discuss limiting armaments and establishing rules for warfare.

The conference achieved several concrete results: it created the Permanent Court of Arbitration, banned certain weapons like asphyxiating gases and expanding bullets, and established conventions for treating prisoners of war. While the delegates failed to agree on freezing military expenditures or preventing new weapons development, the conference represented a crucial recognition that international law and cooperation could restrain the worst excesses of war.

The limits of incremental reduction 🔗

This model operates on the assumption that if nations can agree to limit weapons at progressively lower levels, they can eventually rule out total war. The Geneva Protocol of 1925 banning chemical weapons, and later treaties like SALT and START limiting nuclear arsenals, followed this logic. However, the approach faces persistent challenges: verification difficulties, technological advancement outpacing agreements, and the fundamental problem that nations retain the capacity to rebuild weapons even after reduction.

Peace through renunciation: pacifism and complete disarmament 🔗

The most radical approach to international peace rejects violence entirely. Pacifism, a term coined in 1901 by French peace campaigner Émile Arnaud, advocates for the complete elimination of military force from international relations. Unlike the previous models that accept violence as sometimes necessary, pacifism argues that power is best stabilized at zero.

Pacifists believe this state could be achieved through different means: governments might unilaterally disarm as a moral example, soldiers might refuse to fight on grounds of conscience, or nations might collectively agree to abandon weapons. Mahatma Gandhi’s successful use of nonviolent resistance in India’s independence struggle demonstrated that pacifist principles could achieve political goals that might otherwise require warfare.

Religious and philosophical foundations 🔗

Pacifism draws on deep religious and philosophical traditions. The Quakers, as early as 1660, repudiated violence in all forms. William Penn’s Province of Pennsylvania remained essentially unarmed from 1681 to 1756, choosing peaceful trade with Native Americans over military confrontation. Buddhist and Hindu concepts of ahimsa, Christian teachings on nonviolence, and secular humanist ethics all contribute to pacifist thought.

The aftermath of World War I saw renewed pacifist movements across Europe and America. Organizations like the War Resisters’ International and the Women’s International League for Peace and Freedom advocated for disarmament and arbitration. The League of Nations convened several disarmament conferences, though support for pacifist ideals varied greatly and ultimately failed to prevent World War II.

Practical challenges of pacifism 🔗

Critics argue that pacifism faces severe practical obstacles. Without defensive capabilities, how can nations protect themselves from aggressors who don’t share pacifist values? The Nazi regime’s treatment of pacifists-imprisoning and killing those who advocated for peace-illustrates the risks. During World War II, even committed pacifists like Bertrand Russell concluded that defeating Hitler represented a unique circumstance where war was not the worst possible outcome.

Yet pacifists counter that accepting violence for any reason makes it easier to justify in other situations. They argue that developing alternatives to violence-through civil resistance, social defense, and nonviolent direct action-offers a more sustainable path to lasting peace than endless cycles of military deterrence.

Comparing the models: what works for peace? 🔗

Each model reveals different assumptions about human nature and international relations. Hegemonic peace assumes that power concentration prevents war, but questions remain about whether such peace is genuinely peaceful or merely imposed order. Balance of power systems acknowledge that distributed power can create stability, but in the nuclear age, this balance requires constant vigilance against catastrophic miscalculation.

Arms control represents a middle ground-accepting that nations will maintain some military capability while seeking to limit its most destructive forms. This approach has achieved real successes in banning certain weapons and reducing arsenals, though progress remains incremental and fragile. Pacifism offers the most transformative vision but faces the greatest implementation challenges in a world where not all actors share its values.

History shows that no single model has delivered perfect, lasting peace. The Pax Romana eventually crumbled. Balance of power systems repeatedly broke down into major wars. Arms control agreements have been violated or abandoned. And pacifist movements, while morally compelling, have struggled to prevent determined aggressors.

Perhaps the lesson is that international peace requires drawing on multiple approaches simultaneously: maintaining sufficient defensive capability while actively pursuing disarmament, building international institutions while preserving national sovereignty, and cultivating cultures of nonviolence while remaining prepared to defend against those who would exploit such restraint.

What do you think? Can genuine peace exist under hegemonic dominance, or does it require equality among nations? Is the “balance of terror” a sustainable long-term strategy for preventing war, or does it merely postpone inevitable catastrophe? How might the principles of pacifism be practically applied in a world where not everyone shares those values?

References

1. https://en.wikipedia.org/wiki/Pax_Romana
2. https://www.routledge.com/Hegemonic-Peace-and-Empire-The-Pax-Romana-Britannica-and-Americana/Parchami/p/book/9781138819719
3. https://blogs.gwu.edu/ccas-panamericanos/peace-studies-wiki/peace-studies-wiki/approaches-to-peace/balance-of-power/
4. https://en.wikipedia.org/wiki/Balance_of_terror
5. https://avalon.law.yale.edu/19th_century/hag99-04.asp
6. https://en.wikipedia.org/wiki/Pacifism