CSS Current Affairs | Classical Realism: Human Nature Causes Conflict
Classical Realism is an international relations theory that argues that conflict arises from the inherent nature of human beings and their pursuit of power. By emphasizing power politics, national interest, and the inevitability of competition among states, Classical Realism has become an important topic in International Relations, Political Science, and CSS Current Affairs.

Introduction
Classical Realism is one of the oldest and most influential theories of International Relations. It argues that conflict and competition among states are primarily rooted in human nature. According to this theory, human beings naturally seek power, security, and survival, and because states are led by humans, they behave in a similar manner. As a result, international politics is characterized by rivalry, power struggles, and the continuous pursuit of national interest. Classical Realism views conflict as an unavoidable feature of international politics and emphasizes that peace can only be maintained through a balance of power rather than idealism or moral principles. This theory has significantly influenced foreign policy, diplomacy, and strategic studies across the world.
Definitions
Classical Realism is a theory of international relations that explains conflict among states as a result of human nature and the desire for power.
According to Hans J. Morgenthau:
“International politics, like all politics, is a struggle for power.”
According to Reinhold Niebuhr:
“The will-to-power, expressed in individuals and nations alike, makes conflict an enduring feature of human society.”
Meaning of Classical Realism
Classical Realism argues that international politics reflects the nature of human beings. Since humans naturally seek power, security, and self-preservation, states, being governed by humans, also compete for power and influence.
According to this theory, states cannot fully trust one another because every state seeks to protect and advance its own national interests. Even when cooperation occurs, it is often temporary and based on calculations of power and benefit rather than permanent friendship. Therefore, international politics is characterized by competition, alliances, and occasional conflict.
Classical Realists believe that peace is maintained not because states become morally better but because competing powers create a balance that discourages aggression.
Characteristics of Classical Realism
Human Nature as the Source of Conflict
Classical Realism argues that human beings naturally seek power, dominance, and security. Since political leaders possess these same characteristics, states often compete with one another for influence and survival.
National Interest Comes First
States always prioritize their national interests over the interests of other countries. Foreign policy decisions are primarily guided by considerations of security, power, and national survival.
Politics Is a Struggle for Power
Power is regarded as the central element of international politics. States continuously seek to protect or increase their power in order to secure their interests.
Conflict Is Inevitable
Because states pursue competing interests and power, conflict cannot be completely eliminated. Cooperation may occur, but competition always remains a possibility.
Morality Has Limited Influence
Classical Realists do not reject morality completely, but they argue that moral principles cannot override national survival. Governments often make difficult decisions based on national interest rather than ethical ideals.
Balance of Power Promotes Stability
No single state should become overwhelmingly powerful. A balance of power among competing states helps discourage aggression and contributes to international stability.
Historical Evolution of Classical Realism
The roots of Classical Realism can be traced to ancient political thought. Thucydides, in his account of the Peloponnesian War, argued that fear, power, and self-interest drive relations between states.
Later, Niccolò Machiavelli emphasized that rulers must prioritize state survival and political stability over moral considerations. Similarly, Thomas Hobbes described human beings as naturally competitive and argued that conflict arises from the desire for power and security.
In the twentieth century, Hans J. Morgenthau systematically developed Classical Realism in his influential work Politics Among Nations. His ideas became highly influential during the Cold War and continue to shape international relations today.
Core Assumptions of Classical Realism
Human Nature Is Self-Interested
Classical Realists believe that human beings naturally seek power and pursue their own interests. Since states are led by humans, they display similar behavior.
States Are the Primary Actors
States are considered the most important participants in international politics. International organizations and other actors have limited influence compared to sovereign states.
National Interest Guides Foreign Policy
Governments make decisions primarily to protect national security and promote national interests rather than global welfare.
Power Determines Influence
The ability of a state to influence others depends largely on its military, economic, and political power.
International Politics Is Competitive
Since every state seeks security and influence, competition is an unavoidable feature of international relations.

Key Concepts of Classical Realism
Power
Power is the ability of a state to influence the behavior of other states and protect its own interests.
National Interest
National interest refers to the goals and priorities that a state seeks to achieve in order to ensure its security, prosperity, and survival.
Balance of Power
The balance of power exists when competing states possess relatively equal power, preventing any one state from dominating others.
Security
States continuously seek to strengthen their security because they cannot rely completely on other countries for protection.
Prudence
Classical Realists argue that political leaders should make careful and practical decisions based on national interest rather than emotions or idealistic expectations.
Comparison with Related Theories
| Basis | Classical Realism | Neorealism | Liberalism |
| Main Cause of Conflict | Human nature | International anarchy | Failure of cooperation |
| Main Actor | Sovereign state | Sovereign state | States and international institutions |
| View of Human Nature | Self-interested | Less emphasis | Capable of cooperation |
| Main Goal | Survival and power | Survival in an anarchic system | Cooperation and peace |
| Major Scholar | Hans Morgenthau | Kenneth Waltz | Robert Keohane |
Modern-Day Relevance of Classical Realism
Great Power Competition
Classical Realism continues to explain rivalry among major powers competing for influence and strategic advantages.
Example: Strategic competition between the United States and China in economic, technological, and military domains.
National Security Policies
Governments continue to prioritize military preparedness and national security in response to perceived threats.
Example: Many countries continue to modernize their armed forces to strengthen national defense.
Military Alliances
States often form alliances to maintain a balance of power and deter potential adversaries.
Example: North Atlantic Treaty Organization serves as a collective security alliance among member states.
Regional Conflicts
Classical Realism helps explain why territorial disputes and geopolitical rivalries continue despite international organizations promoting peace.
Example: Territorial disputes in the South China Sea.
Foreign Policy Decision-Making
Many governments continue to formulate foreign policy based primarily on national interests rather than purely moral considerations.
Example: States often impose sanctions or pursue strategic partnerships to protect their own interests.
Criticism and Limitations of Classical Realism
Overemphasizes Human Nature
Critics argue that the theory places too much emphasis on human nature while paying less attention to international institutions, economic interdependence, and domestic politics.
Underestimates International Cooperation
Many examples show that states can cooperate successfully through diplomacy, treaties, and international organizations.
Limited Role for International Law
Classical Realism gives relatively little importance to international law and global institutions, despite their growing influence.
Cannot Fully Explain Peaceful Relations
The theory struggles to explain why many democratic and economically interconnected countries maintain peaceful relations over long periods.
Ignores Non-State Actors
Modern international politics increasingly involves multinational corporations, international organizations, terrorist groups, and NGOs, which Classical Realism does not fully address.
Conclusion
Classical Realism is one of the foundational theories of international relations, emphasizing that human nature is the primary source of conflict among states. It argues that political leaders, like individuals, naturally seek power, security, and survival, making competition an enduring feature of international politics. Through concepts such as national interest, balance of power, and prudence, Classical Realism provides a practical framework for understanding diplomacy, foreign policy, and global conflicts. Although criticized for underestimating cooperation and international institutions, it remains one of the most influential approaches for explaining state behavior and the pursuit of power in world politics.
Takeaways
- Classical Realism explains international conflict primarily through human nature.
- It argues that individuals and states naturally seek power, security, and survival.
- Hans J. Morgenthau is the principal modern scholar of Classical Realism.
- Power, national interest, balance of power, security, and prudence are its central concepts.
- States are regarded as the primary actors in international politics.
- Conflict is considered inevitable, while cooperation is often temporary and interest-based.
- The theory continues to explain great power rivalry, military alliances, and strategic competition.
- Despite criticisms, Classical Realism remains one of the most influential theories in International Relations.
References
- Encyclopaedia Britannica – Realism (Political Science)
- Stanford Encyclopedia of Philosophy – Political Realism in International Relations
- Politics Among Nations: The Struggle for Power and Peace
- History of the Peloponnesian War
- The Prince
- Leviathan
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