Theories and Approaches in International Relations

Why do we Study Theory in International Relations?

International Relations (IR) is the study of how nation-states, international institutions, and non-state actors interact within a system that has no single authority above them. Because the same event — a war, a treaty, a trade deal — can be explained in radically different ways, we need theory: a simplified map that tells us what to look at, what to ignore, and what to expect next.

Theory versus Approach

An approach is a set of standards that decides which questions and which data are worth including in a study; it is the lens a scholar chooses. Since every scholar can pick a different lens, the number of possible approaches is unlimited, so we group the important ones into families. An approach, once used to explain a phenomenon and to make predictions, matures into a theory — a structured explanation of why states behave as they do. In short: an approach builds a theory.

A scholar begins with a phenomenon (say, the outbreak of a war), tries to explain it, predicts future behaviour, and refines techniques — and out of this cycle a distinct theory is born.

Significance of IR theory for an aspirant

• Analytical depth: the same current event (Russia–Ukraine war, US–China rivalry) can be dissected through several lenses, giving a balanced, multi-dimensional answer.
• Predictive value: theories such as the security dilemma or complex interdependence help anticipate how states will respond to threats and opportunities.
• Answer enrichment: naming the right thinker (Morgenthau, Waltz, Keohane, Wallerstein) and concept (anarchy, balance of power, cultural hegemony) signals conceptual command in Mains.
• Policy relevance: India’s own foreign policy blends realist caution, liberal institutionalism and idealist moral appeal — theory decodes this mix.

The Family Tree at a Glance

Theory	View of Human Nature	Core Claim about States	Keyword
Idealism	Inherently good	Peace through cooperation, morality & institutions	Harmony / Utopia
Realism	Egoistic, power-seeking	Anarchy compels self-help & power politics	Power / Anarchy
Liberalism	Cooperative, rational	Interdependence & institutions breed peace	Cooperation / Interdependence
Functionalism	Cooperative	Technical cooperation spills over into peace	Spill-over
Marxism	Shaped by economic class	Economic structures & class drive world politics	Class / Structure
Constructivism	Socially constructed	Ideas, identity & norms shape interests	Ideas / Identity

Idealism (Liberal Idealism / Utopianism)

Core thinkers: Woodrow Wilson, Hugo Grotius, Immanuel Kant, Dante Alighieri, Gautam Buddha, Mozi.

Assumption about human nature

Man is inherently good. Bad behaviour is not natural but the product of a flawed environment; therefore, if the environment is reformed, behaviour can be corrected. When faced with conflict, man’s instinct is to resolve it through cooperation.

Foundation in IR

Applied to states, this means the international system strives for peace, and peace is achievable through cooperation. War is seen as harmful and irrational — it erupts only because states misunderstand each other’s interests. If each state understands and accommodates the interests of others, conflicts can be settled amicably and peace maintained.

Origin — out of the ruins of the First World War

Competitive alliance-building and the mechanics of the balance of power dragged Europe into the First World War. In its aftermath, the Treaty of Versailles (1919) and the League of Nations — inspired by Woodrow Wilson’s Fourteen Points — sought both an international body to prevent future wars and a behavioural change among states toward peace.

Critics branded these hopeful proposals “idealistic.” Note that idealism was never rigorously developed into a full “school,” so some scholars deny it that philosophical status.

Core principles

• Faith in human reason and a vision of the world as it ought to be.
• A set of universal ethics and the ideal of “one world” with the global citizen at the centre.
• Belief that people will always cooperate to achieve harmony rather than choose war.
• Education is vital — an educated public reason better and restrains leaders toward peace.
• Public opinion in decision-making is paramount, and international organisations are crucial to global harmony.

Three streams of Idealism

Stream	Distinctive emphasis	View of war	Notable stance
Pacifists	Human reason, morality, democracy, public opinion	War is bad	Greater role of morality in world affairs
Globalists	Harmony of interests + universal ethics	War is bad	“One world”, universal ethics
Classical Liberalism	Capitalism; “some greed is good”	War is irrational	Emphasis on capitalism & free enterprise

Criticism — the Realist attack

The very label “Idealist” was pinned on these inter-war scholars by the Realists, who rose after the League failed to stop the Second World War.

E.H. Carr dismissed them as “Utopians” who fantasised about a world that ought to be instead of accepting the world as it is. For Carr, power is a constant that cannot be removed from statecraft, and IR is essentially power politics.

Idealists, the charge goes, overestimated morality and neglected power as instruments of state.

Why Idealists are called the “intellectual precursors of Realists” By setting up morality-versus-power as the central debate, the Idealists gave Realism its target and its vocabulary. Realism defined itself against idealism — hence the two are intellectually inseparable, and idealism is rightly seen as the tradition that provoked realist thought.

Realism

Core thinkers: Thucydides, Sun Tzu, Kautilya, Machiavelli, Hobbes, Rousseau, E.H. Carr, Reinhold Niebuhr, Nicholas Spykman, Hans Morgenthau, Kenneth Waltz, John Mearsheimer.

Key concepts: Power, National Interest, National Security, Conflict, Balance of Power, Deterrence.

Assumption about human nature

Man is egoistic and self-interested; his supreme interest is survival. Living among others who also chase their own interests brings him into conflict. Man does not merely dislike being dominated — he loves to dominate. This is the universal template of human behaviour that Realism scales up to the state.

The six core concepts

1. Power – a relational concept: the ability of one state to control the actions of another. In Realism it carries a strong military connotation — power is essentially military capability.
2. National Interest – individuals share values, build a common culture and identity; protecting that identity and culture, alongside the people, becomes the state’s national interest.
3. National Security – since the state must survive against enemies, securing its people is the primary national interest.
4. Conflict – man is conflict-prone because he must ensure survival. As there is no authority above the state, the system is one of anarchy; anarchy forces the state into self-help — building economic and military capability.
5. Balance of Power – one state’s weaponisation makes others insecure; they respond by forming alliances, subverting, or arming up, so that power is balanced once again.
6. Deterrence – the balance of power in the nuclear age: a threat of punishment (typically nuclear) that dissuades an adversary from unwanted behaviour.

Foundation and the logic of anarchy

Each nation-state intends to survive; its core interest is national security. Because every state must fend for itself, the system is anarchic, and self-help drives states to expand power. This expansion disturbs equilibrium, brings states into conflict, and makes war, at times, inevitable — war being justified as a fight for survival. Classical Realists give the state primacy and relegate the UN, WTO and similar bodies to a secondary role.

Origin — Realism’s ancient roots

Though Realism crystallised against inter-war idealism, its ideas are ancient: Thucydides on the Peloponnesian War, Kautilya’s Arthashastra, and Sun Tzu’s Art of War. Hobbes articulated the security dilemma.

Realism therefore did not simply “rise from the ashes” of the Second World War.

Case Study — Thucydides and the Melian Dialogue (Melos, 416 BCE) Set during the Peloponnesian War (431–404 BCE), the episode at Melos (416 BCE) is Realism’s oldest lesson. For Thucydides, states are not equal, and justice depends on a state’s standing in the system, not on abstract equality. When mighty Athens confronted tiny Melos, Melos appealed to its dignity as an independent city-state. Thucydides’ verdict: Melos could not claim justice because its unequal status to Athens could not warrant it. “The strong do what they can; the weak suffer what they must.”

Case Study — Hobbes and the Security Dilemma Hobbes traced man from nomad to settled community. In the state of nature — a pre-civil condition — man is insecure, so he forms a sovereign state out of fear. But every community does the same, breeding fear of other states. This is the security dilemma: man can guarantee individual security within a state but not international security among sovereigns — leaving war as one available tool.

Classical Realism: Morgenthau and Machiavelli

Hans Morgenthau calls man a political animal driven by animus dominandi — an egoistic lust for power. Ironically, this same lust drives the search for safety, ending in control over territory and the creation of a state. Applied to states, the craving for more land and resources brings them to the brink of war; a wise ruler may use military power to avert a greater evil and maintain the balance of power.

Niccolò Machiavelli (in The Prince) uses the allegory of the lion (strength) and the fox (cunning): a ruler who blends both can seize opportunities in a dangerous world. He rejects the Christian dictum of “loving one’s neighbour,” warning that a strong, smart neighbour may invade — so the ruler must practise power politics to protect his people.

The shift to Neo-Realism (Structural Realism)

Realism moved from Classical to Neo-Realism in the 1980s through Kenneth Waltz’s Theory of International Politics (1979). Waltz shifts the emphasis from human nature to the structure of the system: it is anarchy, not evil men, that compels self-interested behaviour and recurring conflict.

States are “like units” performing similar basic functions; behaviour changes only when the balance of power among great powers shifts. The rise or fall of great powers may break the system but eventually a new balance re-emerges. Because structure determines behaviour, Neo-Realists are structuralist determinists; they accept non-state actors but still grant the state primacy.

Classical vs Neo-Realism

Basis	Classical Realism	Neo-Realism (Structural)
Root cause of conflict	Evil / power-lust in human nature (animus dominandi)	Anarchic structure of the system
Key thinker	Morgenthau, Machiavelli, E.H. Carr	Kenneth Waltz, Mearsheimer
Non-state actors	Largely rejected	Accepted, but state retains primacy
Explanation type	Human-nature based	Deterministic / structural

Realism in the real world

Case Study — The Syrian Crisis (Great-power balancing) Russia’s repeated vetoes of US-sponsored UN resolutions on Syria are read as power politics. Syria — the last Cold-War relic in West Asia — plus Iran gives Russia leverage to contain the US-backed Saudi axis. As Shia strongholds, Syria and Iran balance Sunni dominance; a US-engineered regime change would tilt the axis toward the Sunni side. Russia thus uses Syria to preserve a regional balance of power.

Case Study — Iran’s Nuclear Ambitions (Hegemony & balancing) Iran’s programme began under the US Atoms for Peace (1953); the 1979 Islamic Revolution halted it, but the Iran–Iraq War and Gulf War-I revived the drive toward a weapon. A nuclear Iran would gain a regional edge, tilt the balance toward the Shia axis, and offset a non-nuclear Saudi Arabia.

Liberalism

Key thinkers: John Locke, John Burton, Paul Taylor, Joseph Nye, Robert Keohane, Michael Doyle, Karl Deutsch, Christopher Mitchell.

Assumption about human nature

Man has the cognitive capacity to reason. He acts on self-interest only up to a point; his deeper urge is to cooperate — for the welfare of others and for his own intellectual stimulation. Man, in essence, is a cooperative animal.

Foundation in IR — the social contract

The state is not merely an instrument of war. It arises from a social contract between individuals and the state, and its duty is to create conditions for individual growth — which is only possible if states cooperate.

Cooperation on mutual interest, often facilitated by international organisations, breeds interdependence; interdependent states resolve disputes peacefully because mutual welfare outweighs the gains of war.

As states modernise, cooperation deepens and the likelihood of war falls. The core of Liberalism is therefore human cognition, freedom, cooperation, peace, progress, mutual interest, modernisation and liberal democracy.

Neo-Liberalism and its four types

A sub-school, Neo-Liberalism (emerging with the Industrial Revolution, c. 1780–1850), accepts core liberal principles but is less optimistic about cooperation and pushes it onto a larger, structured scale. It is usually presented in four types.

Type	Central logic
A. Interdependency Theory	Keohane & Nye’s complex interdependence (1970s): as societies modernise and integrate, they grow interdependent; in conflict they choose negotiation over war to protect mutual gains.
B. Institutional Liberalism	International organisations are platforms that foster cooperation and compliance; fearing non-compliance, states use institutions to build trust and settle disputes peacefully.
C. Sociological Liberalism	IR is more than inter-state relations — it includes people, groups and civil society. Karl Deutsch: rising communication & transaction (tourism, trade, labour movement) unifies societies and promotes peaceful conflict resolution.
D. Republican Liberalism	Democratic Peace: democracies, being transparent and law-abiding, do not fight each other, but view dictatorships as threats (opacity, deception) and may seek to replace them — sometimes triggering fresh conflict.

Across all four types, Neo-Liberals argue that the world order is built by interaction among states, not by the balance of power. Global problems — climate change, drug trafficking, illicit finance — exceed any single state’s resources and demand cooperation, prioritisation, and transparent, democratic consensus.

John Burton’s Billiard-Ball Model (1972) Burton captured the Realism–Liberalism divide vividly. Realism is like billiard balls — hard, self-contained state actors colliding in an enclosed space. Liberalism is a complex mosaic of many actors whose deep interactions produce integration and cooperation.

Case Study — US Invasion of Iraq (Republican Liberalism) A democracy (the US) perceived a dictatorial threat: Saddam’s Iraq, which had used chemical weapons in Gulf War-I, was feared to hold weapons of mass destruction and to deceive IAEA inspectors. The US invaded to remove the dictator and “secure peace,” followed by democracy promotion and nation-building. The long-term result, however, was regional unrest, territorial fragmentation and a rise in fanaticism and terrorism — illustrating the theory’s own warning that forced democratisation can backfire.

Functionalism and Neo-Functionalism

Thinkers: David Mitrany, Ernst Haas, A.J.R. Groom. It shares Liberalism’s view that man is cooperative, and emerged as an alternative to Neo-Realism, rooted deeply in liberal thought.

Mitrany’s functionalism

• Transnational actors — run by technicians, not politicians — are key to a stable world order because they integrate societies.
• Nation-states, by themselves, do not generate the needed cooperation. So begin with non-political cooperative groups at the micro-level (health, education) and replicate upward to the macro-level (culture, transport).
• Because these groups rest on mutual interest, they provoke no resistance.
• Success triggers the spill-over effect: cooperation in one sector automatically pushes states to cooperate in others, steadily raising peace and reducing the relevance of the nation-state.

Neo-Functionalism

Where functionalists would turn nation-states into “museums of institutional curiosity,” Neo-Functionalists seek to integrate existing states through political interaction and cooperative decision-making. Ernst Haas argues that full integration requires rulers to surrender some sovereignty and pool resources for growth.

Case Study — The European Union Haas’s classic example: EU member leaders have surrendered slices of sovereignty (over trade, currency, mobility) and pooled resources for the growth of the whole union — a textbook demonstration of spill-over and pooled sovereignty in action.

Marxism and the International Political Economy

Core thinkers: Karl Marx, V.I. Lenin, Antonio Gramsci, Robert W. Cox, Immanuel Wallerstein.

Human nature, society and “totality”

Marxism reads world politics through class and deep economic structures. For Marx, the social world must be studied as a totality — history, economics and politics together, never in isolation.

Change in history is driven by change in economic production, and history is a story of class struggle between the capitalist (bourgeoisie) who own the factors of production and the labour (proletariat) who sell their labour to survive. Tension between the factors of production and the relations of production both produces and determines a society’s history (developed in Wage Labour and Capital and Das Kapital, 1867).

Bringing economy into IR

The state issues currency, the legal instrument of market exchange — so state and market interact, and this interaction is the heart of international political economy. Yet after the World Wars, war-and-peace crowded economy out; as Charles de Gaulle quipped, the economy could be left to “lesser minds.”

Economy re-entered IR from the 1970s — the US–Vietnam drain, the 1973 oil crisis, Soviet strain in Eastern Europe under Gorbachev, and post-Cold-War globalisation all forced economics back to centre stage.

Three economic ideologies feeding into the debate

Ideology	Core claim
Mercantilism (16th–17th c.)	Politics should use economics for power. The world is a zero-sum arena — one state’s gain is another’s loss. Watch rivals’ economic gains, for wealth converts into military power and colonisation. Evolved: acquire bullion → trade surplus → industrialisation & protectionism.
Economic Liberalism	The market should operate freely (laissez-faire); the individual consumer is central and the state is merely an agency. Free trade lets each country specialise, expanding global wealth. But markets can fail (e.g., surge pricing), so some state regulation is desirable.
Marxism	The economy is a site of exploitation and class inequality; capitalists extract profit from labour without sharing it. Capitalism is progressive over feudalism (labour has some choice) but the proletariat will ultimately overthrow the bourgeoisie and seize the means of production.

Marx adds that each state is driven by the interests of its ruling class. Capitalism’s endless profit urge makes it a repressive, expansionary machinery that migrates abroad hunting cheap labour and new markets — explaining colonialism then and, in the 21st century, globalisation by transnational corporations as “capitalist expansion.”

Case Study — Lenin on Imperialism and Power Re-distribution Britain built colonies and grew strong through imperialism. When a unified Germany became an economic powerhouse, it demanded its share of colonies under Weltpolitik. For Lenin, this was a natural process: a rising power inevitably demands re-division of spheres of influence, and the resulting disparity bred the conflict that climaxed in the First World War.

Gramsci — cultural hegemony

Antonio Gramsci asked why revolution succeeded in backward Russia yet failed in industrial Western Europe. His answer, in the Prison Notebooks: power is a mixture of coercion and consent. Where consent dominates, the ruling class first controls cultural, moral and political values, then diffuses them across classes through civil society, so the masses come to accept these values as “common sense.” This is cultural hegemony.

Since Marx studied only the base, Gramsci insists we also study the superstructure (moral and cultural values); the order can be challenged only when counter-hegemonic blocs emerge.

Robert Cox — critical theory

Robert W. Cox famously declared that “theory is always for someone and for some purpose” — knowledge reflects context, time and space and is never timeless. Theorists often legitimise the status quo, making society believe IR follows natural, unchangeable laws.

In Production, Power and World Order (1987) he argues that an Anglo-US axis has built a world order sustained not only by coercion but by consent — persuading even disadvantaged societies that free trade benefits all. Cox predicts counter-hegemonic movements will eventually challenge this “common sense.”

Wallerstein — World-Systems Analysis

Immanuel Wallerstein sees the world as unified zones where politics and economics interact. He distinguishes the World Empire System (unified politics + economics, e.g., the Holy Roman Empire) from the World Economic System (unified economy, decentralised politics). The capitalist world-economy is a hierarchy:

Zone	Role in the system
Core	Strong states, mass markets, advanced production; appropriates surplus.
Periphery	Weak states producing basic goods (wood, sugar, grain); surplus flows out to the core through unequal exchange.
Semi-Periphery	Intermediate states with some industrial base; act as a buffer / shock absorber that diffuses systemic tension.

The engine is unequal exchange — surplus flows from periphery to core, enforced by strong states. Wallerstein predicts the system will eventually reach crisis when the quest to expand halts; with the Cold War’s end, he argues, the world-system (born in 16th-century geographic discoveries) has entered its crisis phase.

Case Study — The 2008 Financial Crisis (a Marxist reading) Far from ending Marxism, crises revive it. The 2008 banking collapse forced state bailouts; heavily indebted states turned to austerity, raising unemployment and threatening the political order. David Harvey’s summary — “privatise profits, socialise risks, save banks, but put the screws on the people” — captured it. In the US it erupted as the Occupy movement (2011) under the slogan “We are the 99%.”

Contemporary and Critical Approaches

Beyond the classical quartet, modern IR is enriched by approaches that question who and what mainstream theory leaves out. They are increasingly relevant to Mains answers on identity, gender, decolonisation and the environment.

Constructivism

Alexander Wendt, Nicholas Onuf. Constructivism argues that the international system is socially constructed, not materially fixed. States’ interests flow from their identities, which are shaped by ideas, norms, culture and shared understandings.

Wendt’s dictum — “anarchy is what states make of it” — means anarchy has no single logic: 500 British nuclear weapons are less threatening to the US than a handful of North Korean ones because of shared meanings.

Change in ideas can change the system, explaining phenomena Realism cannot, such as the peaceful end of the Cold War

Feminist IR

J. Ann Tickner, Cynthia Enloe. Feminism exposes the gender blindness of traditional IR. Concepts like power, security and the state are built on masculine assumptions; feminists ask “where are the women?” in war, diplomacy and the global economy, and redefine security to include economic and human security, not merely military defence.

Postcolonialism

Edward Said, Frantz Fanon. Postcolonial theory shows how colonial hierarchies persist in world politics and knowledge. Said’s “Orientalism” reveals how the West constructed the “East” as backward to justify domination. It amplifies the voice of the Global South and critiques Eurocentric IR — resonating with India’s championing of decolonised, plural world order.

The English School

Hedley Bull (“The Anarchical Society”). A middle path between Realism and Liberalism: even under anarchy, states form an “international society” bound by shared rules, institutions and diplomacy (international law, sovereignty, the balance of power). Order is possible without a world government.

Green Theory

Places ecological sustainability at the centre of IR. It argues the state-centric, growth-obsessed system cannot solve transboundary environmental crises like climate change, and calls for cooperative, planet-first governance — the intellectual backdrop to regimes such as the Paris Agreement.

Applying the Theories: Why Do Wars Happen?

The surest test of a theory is what it explains. War — the oldest problem in international politics — is where the schools set out above diverge most sharply, because each locates the cause of conflict somewhere different, and therefore prescribes a different route to peace.

War has been a ubiquitous feature of human history, the ultimate instrument by which states impose their will. The UN treats a major conflict as one causing 1,000 or more deaths, while ‘total war’ — exemplified by the two World Wars — treats all of society’s resources, and even civilians, as legitimate targets.

The Theoretical Lenses on War

School / Thinker	Explanation of War
Thucydides (Classical Realism)	War springs from human greed and the lust for power — infinite desires chasing finite resources.
Realists	War is inevitable because the international system is anarchic; all states, whatever their politics, seek to maximise power. Only ending anarchy could end war.
Liberals	The ‘democratic peace’ thesis — democracies rarely fight one another; authoritarian states, lacking internal checks, treat war as legitimate policy.
Marxists	War is a product of capitalism — the drive to expand into new zones of profit leads to plunder, though trade and interdependence now weaken this urge.
Clausewitz (On War, 1832)	War is the ‘continuation of politics by other means’ — a rational instrument to compel an opponent to submit.

Kenneth Waltz’s Three Levels of Analysis Waltz located the causes of war at three levels — a framework still central to the discipline: 👉 The individual (human nature, and the ambitions and psychology of leaders); 👉 The state (a country’s internal political and economic structure); 👉 The international system (the anarchic structure that permits war). For Waltz, this third image is the deepest cause — the logic that underpins his Neo-Realism above.

The Rise of ‘New Wars’

The end of the Cold War transformed the nature of conflict itself. Scholars call this the era of ‘new’ or postmodern war — what Mary Kaldor termed the post-Clausewitzian, post-Westphalian phase. Where classical wars were fought between states to impose one’s will, the new wars (Afghanistan, Iraq, Chechnya, and across Africa) look utterly different.

Old Wars vs New Wars Actors: state armies give way to a mix of militias, warlords, non-state actors and terrorists. Type: the vast majority of post-Cold War conflicts are civil (intra-state), not inter-state. Fallout: they breed failed states — often scarred by tribal rivalry and colonial-era underdevelopment — that become zones of lasting turmoil. Paradox (Gray): even as actual battles shrink, states keep investing heavily in advanced weapons development.

The trend has only deepened since. Twenty-first-century conflict is increasingly defined by cyber warfare, drone and autonomous weapons, hybrid and ‘grey-zone’ tactics, and information warfare — blurring the line between war and peace, and between the military and the civilian, more than ever before.

This matters theoretically as well as practically: if war is no longer chiefly a contest between states, then a Realism built on state anarchy explains less than it once did, and Constructivist and Critical approaches — attentive to identity, ideology and non-state actors — gain explanatory ground.

Comparative Snapshot

A one-glance revision grid contrasting the major theories on the questions examiners care about.

Dimension	Realism		Liberalism	Marxism	Constructivism
Key actor	State		States, institutions, individuals	Classes / economic structures	States & shared ideas
Driver of politics	Power & anarchy		Cooperation & interdependence	Class conflict & capital	Ideas, identity, norms
View of anarchy	Permanent, conflictual		Tameable by institutions	Secondary to economics	“What states make of it”
Prospect for peace	Pessimistic		Optimistic	Only after capitalism ends	Possible if ideas change
Indian resonance	Strategic autonomy, deterrence		Multilateralism, SAARC/BRICS/G20	Global South, unequal trade	Soft power, civilisational identity

Interlinkages to remember

• Idealism ↔ Realism: Realism defined itself by attacking idealism; the two frame the founding debate of IR.
• Liberalism ↔ Functionalism: Functionalism is liberalism applied to technical cooperation — spill-over is interdependence in slow motion.
• Marxism ↔ Postcolonialism / World-Systems: both expose structural inequality between a dominant core and a subordinated periphery/Global South.
• Constructivism ↔ all others: it does not deny power or institutions but asks how meaning makes them matter.

Why Theory Still Matters — Relevance and Way Forward

No single theory explains everything; each is a partial map. Contemporary world politics is best read as a layering of these lenses.

• Realism explains the US–China strategic rivalry, nuclear deterrence in South Asia, and India’s insistence on strategic autonomy.
• Liberalism / Functionalism explains the pull of the UN, WTO, G20, BRICS, SAARC and the EU, and the logic of interdependence that raises the cost of war.
• Marxism / World-Systems illuminates North–South inequality, debt distress in the Global South, and critiques of an unequal trade order.
• Constructivism & Postcolonialism decode soft power, identity politics, civilisational diplomacy and the demand for a decolonised, reformed multilateralism.

Way forward for you: treat theories as complementary tools, not rival dogmas. A high-scoring Mains answer typically opens with the dominant lens, enriches it with a second, and closes with a balanced, theory-informed judgement grounded in current examples.