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Learn International Relations

Why states go to war, make deals and build institutions with each other.

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International relations studies how states and other actors, such as international organizations, companies and armed groups, interact across borders. It asks why wars start, why cooperation is possible without a world government, and how power, trade and ideas shape outcomes. The field is organized around rival theories: realism stresses power and survival in an anarchic system, liberalism stresses institutions, trade and democracy, and constructivism stresses shared ideas and identities. You learn to apply them to cases from the Peloponnesian War to the Cold War and current events. Learnr builds a course that pairs each theory with real cases and quick analysis questions.

How to learn International Relations, step by step

Learn the vocabulary of the system. Get precise about sovereignty, anarchy (no authority above states, not chaos), national interest, hegemony and polarity. Many textbooks trace the sovereign state system to the 1648 Peace of Westphalia, though historians now debate how much it really changed.
Master realism with a classic case. Read the Melian Dialogue from Thucydides, then learn Hans Morgenthau's classical realism and Kenneth Waltz's structural realism. Practice explaining an alliance or arms race purely in terms of power and security.
Set liberalism and constructivism against it. Learn how Robert Keohane and Joseph Nye argued that interdependence and institutions make cooperation possible, the debated democratic peace thesis, and Alexander Wendt's argument that anarchy is what states make of it. Apply all three to the end of the Cold War.
Study war and deterrence concretely. Work through the security dilemma, the logic of nuclear deterrence and the Cuban Missile Crisis of 1962. Simple game theory models such as the prisoner's dilemma help show why rational states can still end up in conflict.
Follow how institutions really operate. Learn the UN Charter of 1945, the veto held by the five permanent Security Council members, and bodies such as the WTO and IMF. Then read one recent Security Council resolution and identify who supported it and why.
Practice on current events. Pick a news story each week and write which theory explains it best and what evidence would prove you wrong. Short Learnr lessons can rehearse the theories daily so applying them becomes a habit.

What you'll learn

Explain anarchy, sovereignty and the balance of power
Compare realist, liberal and constructivist explanations of the same event
Describe how the United Nations, its Security Council and other institutions work
Analyze the security dilemma, deterrence and causes of war
Explain how trade, sanctions and global economic institutions affect state behavior

What's inside your International Relations course

A sample path Learnr builds for International Relations. Your real course adapts to your goal and level.

1. States, sovereignty and the international system
2. Realism and the balance of power
3. Liberalism, institutions and interdependence
4. Constructivism, norms and identity
5. War, deterrence and nuclear weapons
6. International law, the UN and the global economy

How long does it take to learn International Relations?

Covering the major theories and core topics, roughly an introductory college course, takes about 8 to 12 weeks at 3 to 5 hours a week. Getting comfortable analyzing current events takes ongoing reading beyond that.

What you need before you start

No prerequisites. Some modern world history, especially the two world wars and the Cold War, gives you cases to apply the theories to.

Common mistakes to avoid

Picking one theory as the truth and ignoring the rest. Use each as a lens and ask which explains a given case best.
Reading anarchy as meaning chaos. In this field it means only that there is no government above states.
Learning theories without cases. Tie every concept to at least one real crisis, treaty or war you can describe.

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International Relations questions, answered

What are the main theories of international relations?

The three most taught are realism, which focuses on power and security, liberalism, which focuses on institutions, trade and democracy, and constructivism, which focuses on ideas, norms and identities. Marxist, feminist and English School approaches are also studied.

Is international relations the same as political science?

It is usually treated as a subfield of political science, focused on relations between countries, while other subfields study domestic politics, comparative government and political theory.