Realism (IR)

Also known as: Political Realism

framework · political science · organizing-schema

International relations driven by states pursuing power in an anarchic system.

Realism is the foundational tradition in international relations theory holding that international politics is fundamentally a struggle for power among self-interested states in an anarchic system without overarching authority. The tradition descends from intellectual antecedents including Thucydides (Melian Dialogue, 5th century BCE), Niccolò Machiavelli, Thomas Hobbes (state of nature analysis applied to states), and substantial 20th-century formalization through Hans Morgenthau's classical realism (Politics Among Nations, 1948 — emphasizing the human drive for power as the foundation), E.H. Carr's interwar realism (The Twenty Years' Crisis, 1939 — critique of liberal idealism), and Kenneth Waltz's structural neorealism (Theory of International Politics, 1979 — locating cause of state behavior in the anarchic structure of the international system rather than in human nature). Subsequent realist developments include offensive realism (John Mearsheimer's The Tragedy of Great Power Politics, 2001 — states maximize relative power, making conflict more likely than defensive realism predicts); defensive realism (Stephen Walt, others — states seek security, balance against threats); and neoclassical realism (Gideon Rose, Fareed Zakaria — incorporating domestic political variables). Core realist commitments include: states are the principal actors; states pursue self-interest, principally power and security; the international system is anarchic (no overarching authority); cooperation is difficult and fragile; military force remains the ultimate arbiter. Realism has been the dominant or co-dominant tradition in international relations theory throughout the postwar period, with substantial influence on US foreign policy through scholar-practitioners including Henry Kissinger and many others. The tradition has faced substantial challenges from liberalism, constructivism, and various critical traditions.

Originators

Thucydides (intellectual antecedent, 5th century BCE); Niccolò Machiavelli; Thomas Hobbes; E.H. Carr (interwar foundation, 1939); Hans Morgenthau (classical realism foundational, 1948); Kenneth Waltz (structural neorealism, 1979); subsequent realists including John Mearsheimer, Stephen Walt high

Year / Decade

5th century BCE (Thucydides antecedent); 1939 (Carr); 1948 (Morgenthau classical); 1979 (Waltz structural); ongoing high

Primary sources

Thucydides. History of the Peloponnesian War (5th century BCE), Carr, E.H. (1939). The Twenty Years' Crisis, Morgenthau, H.J. (1948). Politics Among Nations, Waltz, K.N. (1979). Theory of International Politics, Mearsheimer, J.J. (2001). The Tragedy of Great Power Politics high

Core components

States as principal international actors
State self-interest in power and security
International anarchy (no overarching authority)
Distrust and cooperation difficulty
Variants: classical (Morgenthau, human nature), structural/neorealist (Waltz, system structure), offensive (Mearsheimer), defensive (Walt), neoclassical
Balance of power
Security dilemma
Self-help system
Distinction from liberalism (institutions, interdependence) and constructivism (norms, identities)
Substantial influence on US foreign policy

Primary use case

Foundational tradition in international relations theory; basis for substantial scholarly and policy analysis of great-power competition, military strategy, and alliance politics; reference framework in international relations education; integration with broader political-science work on conflict and cooperation; foundation for some commercial geopolitical-analysis services; influence on US, Chinese, Russian foreign-policy thinking with substantial cross-national variation; pedagogical foundation in IR curricula globally.

Common criticisms

State-centrism underweights non-state actors (corporations, NGOs, terrorist organizations, international institutions) that have grown substantially in international politics
failure to predict end of Cold War and Soviet collapse — realism's emphasis on material power and state interests gave limited insight into ideological and domestic-political dynamics that drove the collapse
struggles to account for sustained cooperation in international institutions, EU integration, and democratic peace patterns
constructivist critique that 'state interests' are not given but constructed through ideational processes that realism takes as exogenous
critical-theory critique that realism naturalizes existing power arrangements
offensive vs defensive vs neoclassical realism debates suggest the tradition is internally contested and may be more a family resemblance than a unified theory
commercial and political invocation of 'realism' often departs from academic frameworks
tendency to be more useful as critique of liberal-idealist alternatives than as positive predictive theory
cross-cultural application of European-centered framing has been argued to be limited
integration with non-Western IR traditions has been incomplete.

Lineage

Parent of: Hegemonic Stability Theory
Siblings: Liberalism (IR), Constructivism (IR)