Core Characteristics of the Liberal Tradition in IR

When we study international relations, two grand traditions tend to dominate the conversation: realism and liberalism. While realism paints a picture of a world locked in endless competition for power, the liberal tradition offers a more hopeful vision. It argues that states, like individuals, can reason, cooperate, and build a more peaceful world over time. Liberalism does not deny that the international system is anarchic, but it firmly rejects the idea that war is inevitable. This blog explores the main characteristics of the liberal tradition, tracing its philosophical roots and explaining how it continues to shape global politics today.

What is the liberal tradition in international relations? 🔗

The liberal tradition is one of the foundational schools of thought in IR theory. At its heart, it emphasizes cooperation, interdependence, and the role of institutions in shaping how states behave. Liberals argue that states are not driven solely by power and self-interest. Instead, their behaviour is also guided by norms, values, and principles such as democracy, human rights, and economic prosperity.

This perspective stands in direct contrast to realism. Where realists see conflict as a permanent feature of an anarchic world, liberals believe that the right institutions, trade relationships, and shared values can steadily reduce conflict. The liberal view is grounded in a more optimistic reading of human nature and history, but it is not naive. Modern liberalism is firmly rooted in evidence and a deep theoretical tradition rather than utopian dreaming.

Philosophical roots: Locke, Kant, and the Enlightenment 🔗

To understand liberalism in IR, we need to look back at the Enlightenment. The intellectual groundwork was laid by thinkers like John Locke and Immanuel Kant, whose ideas about reason, individual rights, and the social contract created fertile ground for liberal thought.

John Locke and natural rights 🔗

John Locke’s Second Treatise of Government (1689) argued that individuals possess natural rights to life, liberty, and property, and that the purpose of government is to protect these rights. This was a revolutionary claim. It suggested that governments derive their power from the consent of the governed, not from the divine right of kings.

Locke’s idea of natural law implied that human beings are bound by universal principles of justice and morality. This thinking extends naturally to international relations. If individuals can recognise shared rules and cooperate for mutual benefit, then states should be capable of doing the same. The liberal perspective treats states a bit like individuals: rational actors who can abide by norms and institutions designed to promote peace.

Immanuel Kant and perpetual peace 🔗

Immanuel Kant pushed these ideas into the realm of international politics. In his 1795 essay Perpetual Peace, Kant proposed a framework for lasting peace built on republican constitutions, a federation of free states, and universal hospitality. His central insight was that the domestic politics and institutions of states matter enormously in explaining their international behaviour.

Kant argued that liberal, democratic states are inherently more peaceful. His reasoning was simple: when citizens rule, and citizens bear the costs of war, they are rarely eager to fight. He believed that the more liberal states there were, the more peaceful the world would become. This idea is the foundation of what we now call the democratic peace theory, a cornerstone of liberal IR thinking.

Faith in human reason and historical progress 🔗

A core belief of liberalism is its faith in human reason. Liberals generally take a positive view of human nature. They are convinced that rational principles can be applied to international affairs, and that human beings are capable of shaping their own destiny.

This connects to the idea of historical progress. Liberals do not see history as an endless cycle of war and rivalry. Instead, they believe the world can gradually improve. Reason, education, and the spread of liberal values can deliver greater freedom and justice over time. Liberals recognise that people are self-interested and competitive up to a point, but they also believe that individuals share many interests and can engage in collaborative action to achieve them. This is a crucial departure from the realist worldview, which assumes that the pursuit of power is permanent and unchangeable.

The importance of state-society linkages 🔗

One of the most distinctive characteristics of the liberal tradition is its attention to what happens inside states. Realists tend to treat states as unitary “black boxes,” focusing only on how they interact externally. Liberals reject this. They argue that domestic institutions, the nature of a country’s government, and the preferences of its citizens shape its foreign policy.

This is the essence of state-society linkages. A democracy with strong institutions, a free press, and accountable leaders will behave differently on the world stage than an authoritarian regime. Liberalism’s main concern is to construct institutions that protect individual freedom by limiting and checking political power. The Kantian insight that domestic politics drives international behaviour remains perhaps the defining feature of liberal IR theory.

The role of non-state actors 🔗

Perhaps the most visible difference between liberalism and realism is the cast of characters each theory recognises. Realists see states as the only actors that truly matter. Liberals do not dispute that states are important, but they argue that non-state actors play a much larger role than realists assume.

Multinational corporations 🔗

Multinational corporations (MNCs) are companies headquartered in one country with operations in others. Because countries rely on the money and jobs these companies generate, MNCs exert tremendous influence on international affairs. They shape state policy in areas like trade, labour rights, and the environment. They can also encourage governments to uphold human rights and environmental protections, and often partner with NGOs to benefit local communities. For a developing economy, the decisions of large global corporations can carry weight comparable to that of foreign governments.

Non-governmental organizations 🔗

Non-governmental organizations (NGOs) such as Amnesty International and Greenpeace advocate for causes like human rights and environmental protection. They shape public opinion and put pressure on governments. NGOs contribute to peace-building efforts, deliver humanitarian aid, and advocate for global norms. These organisations fit the liberal emphasis on looking beyond states as the only important players in world politics.

Together with international organisations, these non-state actors create meaningful links across state boundaries. They demonstrate that global politics is far more interconnected and layered than a simple state-versus-state contest.

Free trade and economic interdependence 🔗

Economics sits at the centre of the liberal tradition. Liberals argue that free trade is a powerful force for peace. The logic is straightforward: when countries’ economies are interconnected through trade, they are less likely to go to war with each other. War would disrupt the flow of goods, capital, and prosperity that interdependent nations depend on.

This idea of interdependence is central. As states grow mutually reliant on one another to achieve shared interests, they develop strong incentives to cooperate rather than fight. Economic institutions are particularly effective at fostering cooperation because of the substantial benefits that flow from economic integration. Trust, property rights, and a shared expectation of the rule of law make economic disputes easier to settle peacefully. Liberals therefore favour economic and diplomatic tools over military force, believing that the costs of war far outweigh its benefits.

International institutions and the League of Nations 🔗

If trade builds the incentives for peace, institutions provide the machinery. Liberals place enormous importance on international organisations as forums where states can resolve disputes without violence.

The clearest historical example is the League of Nations. Early twentieth-century liberalism, heavily influenced by US President Woodrow Wilson, promoted peaceful relations through the League following the devastation of the First World War. Thinkers like Norman Angell and Wilson were concerned with building a peaceful international order based on cooperation among nation states. The League was meant to be a permanent institution where disputes could be aired and resolved collectively.

The League ultimately failed to prevent the Second World War, a failure that prompted the realist E.H. Carr to write his sharp critique of liberal idealism. Yet the liberal commitment to institutions did not die. After 1945, the same logic produced the United Nations, the World Trade Organization, and the International Monetary Fund. These institutions reflect the liberal belief that structured cooperation produces better outcomes than uncoordinated state action. At the international level, institutions limit the power of states by fostering cooperation and imposing costs on those who break agreements.

Criticisms of the liberal tradition 🔗

No tradition escapes criticism, and liberalism has its share. Realists argue that it is overly idealistic, especially when states act ruthlessly on the basis of national interest and power. The collapse of the League of Nations is often cited as proof that good intentions cannot tame an anarchic world.

A second criticism is more pointed for developing countries. Critics argue that liberalism tends to favour the interests of wealthy, developed nations while overlooking the deep inequalities in the global system. The liberal emphasis on free trade, for instance, has been criticised for benefiting powerful multinational corporations and rich economies while leaving poorer nations at a structural disadvantage. These debates remain very much alive in discussions about globalisation, trade policy, and global governance.

Why the liberal tradition still matters 🔗

Despite these criticisms, the liberal tradition remains one of the most influential frameworks for understanding world politics. Its emphasis on cooperation, institutions, interdependence, and human progress continues to shape how scholars and policymakers think. From climate negotiations to pandemic responses, liberals argue that the biggest challenges of our time cannot be solved by any single state acting alone. They require the kind of multilateral, institution-based cooperation that liberalism has championed for centuries. The tradition reminds us of the power of human agency, the value of democratic institutions, and the genuine possibility of building a more peaceful global order.

What do you think? Do you believe that human reason and historical progress can lead to a more peaceful world, or are there real limits to what cooperation and institutions can achieve in an anarchic system? And given the criticism that free trade favours powerful nations, can liberal institutions ever be fully fair to developing countries?

References

1. https://www.open.edu/openlearn/society-politics-law/introducing-international-relations/content-section-7.2.2
2. https://dennana.in/2024/03/30/liberal-theory-of-international-relations/
3. https://www.e-ir.info/2018/02/18/introducing-liberalism-in-international-relations-theory/
4. https://www.numberanalytics.com/blog/ultimate-guide-liberalism-international-relations
5. https://banotes.org/international-relations/liberalism-international-relations-cooperation-peace/
6. https://www.nobelprize.org/prizes/themes/liberal-internationalism-peace-war-and-democracy/
7. https://openstax.org/books/introduction-political-science/pages/15-6-non-state-actors-beyond-ngos
8. https://fiveable.me/theories-of-international-relations/unit-2/globalization-global-governance/study-guide/acgQbOSlw8ZkYffk
9. https://en.wikipedia.org/wiki/Liberalism_(international_relations)
10. https://jjia.jgu.edu.in/index.php/jjia/article/download/87/86/93