
Political realism, as a distinct theoretical framework in international relations, is often traced back to the early 20th century, with its roots firmly planted in the aftermath of World War I. While elements of realist thinking can be found in the works of classical thinkers like Thucydides and Machiavelli, the modern iteration of political realism emerged more concretely in the interwar period. Scholars such as E.H. Carr, with his 1939 work *The Twenty Years’ Crisis*, and Hans Morgenthau, whose *Politics Among Nations* (1948) became a cornerstone text, are credited with systematizing realist principles. These thinkers emphasized the anarchic nature of the international system, the primacy of state power, and the pursuit of national interest, laying the groundwork for realism’s dominance in Cold War-era political analysis. Thus, while realism’s intellectual lineage is ancient, its formalization as a coherent doctrine began in the mid-20th century, shaped by the geopolitical upheavals of the time.
| Characteristics | Values |
|---|---|
| Origin | Emerged as a distinct theory in the interwar period (1919-1939), gaining prominence after World War II. |
| Key Thinkers | Associated with thinkers like Hans Morgenthau (considered the father of modern political realism), Niccolò Machiavelli, Thomas Hobbes, and Thucydides. |
| Historical Context | Developed in response to the failures of idealism (e.g., League of Nations) and the realities of totalitarianism, World War II, and the Cold War. |
| Core Principles | Emphasizes power politics, state sovereignty, national interest, and the anarchic nature of the international system. |
| Philosophical Roots | Draws from classical realism (ancient and early modern thinkers) and modern realism (20th-century developments). |
| Academic Recognition | Formalized as a dominant IR theory in the 1940s-1950s with Morgenthau's Politics Among Nations (1948). |
| Evolution | Adapted into neorealism (structural realism) by Kenneth Waltz in the 1970s, focusing on systemic factors. |
| Enduring Influence | Remains a foundational perspective in international relations theory alongside liberalism and constructivism. |
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What You'll Learn
- Ancient Origins: Realism's roots in Thucydides' History of the Peloponnesian War
- Machiavelli's Influence: The Prince as a foundational text for realist thought
- Hans Morgenthau: His 1948 work Politics Among Nations formalized modern realism
- Cold War Realism: Dominant ideology during the U.S.-Soviet Union standoff
- Neorealism Emergence: Kenneth Waltz's Theory of International Politics in 1979

Ancient Origins: Realism's roots in Thucydides' History of the Peloponnesian War
The origins of political realism can be traced back to ancient times, and one of the earliest and most influential sources is Thucydides' *History of the Peloponnesian War*. Written in the 5th century BCE, this seminal work chronicles the conflict between Athens and Sparta, offering profound insights into the nature of power, state behavior, and international relations. Thucydides' analytical approach and emphasis on human nature, self-interest, and the pursuit of power lay the groundwork for what would later be recognized as the core principles of political realism. His work is often regarded as the starting point for realist thought, making it essential to understanding when and how political realism began.
Thucydides' realism is evident in his unflinching portrayal of the Peloponnesian War as a struggle driven by power dynamics and self-interest rather than idealism or morality. He famously states that the war was caused by the growth of Athenian power and the fear this inspired in Sparta. This focus on power as the primary motivator of state behavior is a cornerstone of realist theory. Thucydides rejects the notion that states act out of ethical considerations or abstract principles, instead arguing that survival and dominance are the ultimate goals of political entities. This pragmatic view of international relations aligns closely with the tenets of political realism as it would later be developed.
One of the most iconic examples of Thucydides' realist perspective is the Melian Dialogue, a debate between Athenian envoys and the leaders of Melos. The Athenians bluntly assert that "the strong do what they can, and the weak suffer what they must," a statement that encapsulates the realist belief in the primacy of power over justice. This exchange highlights Thucydides' understanding of the anarchic nature of the international system, where states must rely on their own strength and strategic calculations to ensure survival. The Melian Dialogue remains a foundational text for realists, demonstrating the enduring relevance of Thucydides' insights.
Thucydides' emphasis on human nature as unchanging and inherently competitive further cements his status as a precursor to political realism. He argues that fear, honor, and self-interest are constant factors driving state behavior, a perspective that resonates with later realist thinkers like Hans Morgenthau and Niccolò Machiavelli. By grounding his analysis in these universal traits, Thucydides provides a timeless framework for understanding international relations. His work suggests that the dynamics of power and conflict observed in ancient Greece are applicable to any era, making him a foundational figure in the realist tradition.
In conclusion, Thucydides' *History of the Peloponnesian War* is a cornerstone of political realism, offering a detailed and instructive account of state behavior rooted in power, self-interest, and the anarchic nature of the international system. His rejection of idealism, focus on human nature, and pragmatic analysis of conflict provide the intellectual foundations for realist thought. While the term "political realism" would not be coined until centuries later, Thucydides' work clearly marks the ancient origins of this enduring political philosophy. Studying his writings is essential for understanding not only when political realism began but also why it remains a dominant perspective in international relations today.
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Machiavelli's Influence: The Prince as a foundational text for realist thought
Niccolò Machiavelli's *The Prince*, written in 1513 and published posthumously in 1532, is widely regarded as a foundational text for realist thought in political philosophy. Its influence on the development of political realism cannot be overstated, as it introduced a pragmatic and often ruthless approach to statecraft that prioritized power, stability, and survival over moral or ethical considerations. Machiavelli's work marked a departure from the idealistic and moralistic political theories of his predecessors, such as those found in the works of Plato and Aristotle, and laid the groundwork for the emergence of realism as a distinct school of thought.
At the heart of *The Prince* is Machiavelli's argument that effective leadership requires a ruler to be willing to act decisively, even if it means employing deceit, coercion, or force. He famously asserted that it is better for a prince to be feared than loved, as fear ensures loyalty and obedience, whereas love is fickle and unreliable. This emphasis on the practical exercise of power, rather than on abstract principles or moral ideals, resonated with later realist thinkers who sought to understand politics as it is, rather than as it ought to be. Machiavelli's realism was rooted in his observation of human nature and the realities of political life, which he believed were characterized by conflict, self-interest, and the constant struggle for power.
Machiavelli's influence on political realism is evident in his rejection of utopian thinking and his focus on the concrete challenges faced by rulers. He argued that a prince must be adaptable, capable of switching between being a lion (using force) and a fox (using cunning) depending on the circumstances. This pragmatic approach to governance became a hallmark of realist thought, which emphasizes the importance of understanding and navigating the complexities of the international system. Realists, following Machiavelli, view the world as an anarchic realm where states must rely on their own power and strategic acumen to ensure survival and security.
The enduring relevance of *The Prince* lies in its unflinching analysis of power dynamics and its recognition of the often harsh realities of political life. Machiavelli's work challenged the prevailing moral and religious frameworks of his time, advocating instead for a secular and empirical approach to politics. This secularization of political thought was crucial for the development of realism, as it allowed thinkers to analyze politics without the constraints of moral or theological dogma. By focusing on the pursuit and maintenance of power, Machiavelli provided a blueprint for realist thinkers who would later apply these principles to the study of international relations.
In conclusion, Machiavelli's *The Prince* serves as a cornerstone of realist thought by offering a candid and pragmatic guide to the exercise of power. Its emphasis on realism, adaptability, and the primacy of self-interest laid the intellectual foundation for the emergence of political realism as a dominant paradigm in the study of politics and international relations. While Machiavelli's ideas have often been controversial, their impact on the development of realist thought is undeniable, making *The Prince* an essential text for understanding the origins and evolution of political realism.
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Hans Morgenthau: His 1948 work Politics Among Nations formalized modern realism
Hans Morgenthau, a German-American political scientist, is widely regarded as one of the founding fathers of modern political realism. His seminal work, *Politics Among Nations: The Struggle for Power and Peace*, published in 1948, played a pivotal role in formalizing and systematizing realist thought in international relations. This book not only synthesized existing realist ideas but also introduced a coherent framework that would dominate the field for decades. Morgenthau's contribution marked a significant turning point in the development of political realism, grounding it in a rigorous theoretical and philosophical foundation.
Morgenthau's *Politics Among Nations* emerged in the aftermath of World War II, a period marked by the devastation of global conflict and the onset of the Cold War. The book reflected the harsh realities of international politics, emphasizing the anarchic nature of the international system and the centrality of power in state behavior. Morgenthau argued that politics, whether domestic or international, is governed by objective laws rooted in human nature. He posited that the desire for power is a fundamental aspect of human behavior, and this drive shapes the actions of states in the international arena. By anchoring realism in a philosophical understanding of human nature, Morgenthau provided a timeless and universal framework for analyzing world politics.
In *Politics Among Nations*, Morgenthau outlined six principles of political realism, which became the cornerstone of realist theory. These principles included the notion that politics is governed by the laws of power, the idea that the primary goal of states is survival in an anarchic system, and the distinction between the moral aspirations of states and the realities of their actions. Morgenthau also emphasized the importance of prudence and ethical considerations in foreign policy, arguing that while realism acknowledges the constraints of power, it does not preclude the pursuit of moral goals. This nuanced approach distinguished Morgenthau's realism from more cynical or amoral interpretations of power politics.
The publication of *Politics Among Nations* had an immediate and lasting impact on the study of international relations. It provided scholars, policymakers, and students with a clear and accessible guide to understanding the complexities of world politics. Morgenthau's work not only formalized realism as a distinct theoretical paradigm but also set the agenda for subsequent debates in the field. His emphasis on power, national interest, and the anarchic structure of the international system continues to influence realist thought and remains a point of reference for critics and proponents alike.
In conclusion, Hans Morgenthau's *Politics Among Nations* was a landmark contribution that formalized modern realism and established it as a dominant perspective in international relations. By synthesizing realist ideas and grounding them in a philosophical understanding of human nature, Morgenthau provided a durable framework for analyzing state behavior. His work not only reflected the realities of post-World War II international politics but also offered timeless insights into the nature of power and the pursuit of national interest. As such, Morgenthau's 1948 masterpiece remains essential reading for anyone seeking to understand the origins and enduring relevance of political realism.
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Cold War Realism: Dominant ideology during the U.S.-Soviet Union standoff
Political realism, as a dominant ideology, found its most pronounced application during the Cold War, particularly in the standoff between the United States and the Soviet Union. While the roots of political realism can be traced back to ancient thinkers like Thucydides and Machiavelli, its modern iteration gained prominence in the 20th century, especially after World War II. The Cold War period, spanning from the late 1940s to the early 1990s, provided the perfect backdrop for realist principles to flourish. Realism, with its focus on power, national interest, and the anarchic nature of the international system, became the guiding framework for both superpowers as they navigated a bipolar world order.
The onset of the Cold War marked a shift from the idealism that had characterized the post-World War I era, epitomized by Woodrow Wilson's vision of a rules-based international order. Realist thinkers like Hans Morgenthau and George Kennan rose to prominence, arguing that states operate in a self-help system where survival and power maximization are paramount. This perspective resonated deeply with policymakers in both Washington and Moscow, who viewed each other as existential threats. The U.S. adopted a policy of containment, articulated by Kennan, to halt the spread of Soviet influence, while the USSR pursued expansionist policies to secure its sphere of influence. Realism provided a theoretical foundation for these strategies, emphasizing the importance of military strength, alliances, and strategic deterrence.
The arms race, particularly the nuclear standoff, became a central feature of Cold War realism. Both superpowers engaged in a relentless pursuit of military superiority, culminating in the doctrine of Mutually Assured Destruction (MAD). This realist-driven logic posited that the threat of nuclear retaliation would prevent either side from initiating a direct conflict. The Cuban Missile Crisis of 1962 exemplified this dynamic, where both the U.S. and the USSR, guided by realist principles, avoided direct confrontation despite the immense risks. The crisis underscored the realist notion that states prioritize survival above all else, even at the brink of catastrophic war.
Realism also shaped the formation of alliances and proxy conflicts during the Cold War. The North Atlantic Treaty Organization (NATO) and the Warsaw Pact emerged as rival blocs, reflecting the realist imperative of balancing power. Proxy wars in regions like Vietnam, Korea, and Afghanistan became theaters where the U.S. and the USSR competed for influence without engaging in direct military conflict. These conflicts were driven by the realist belief that international politics is a zero-sum game, where one state's gain is another's loss. The ideological divide between capitalism and communism further reinforced the realist framework, as both sides sought to project their power and secure their interests in a divided world.
In conclusion, Cold War realism was not merely a theoretical construct but a practical ideology that dictated the actions of the U.S. and the Soviet Union during their decades-long standoff. Its emphasis on power, security, and the anarchic nature of the international system provided a lens through which both superpowers understood and responded to each other. While the Cold War ended with the collapse of the Soviet Union in 1991, the realist principles that dominated this era continue to influence global politics, serving as a reminder of the enduring relevance of this ideology in understanding state behavior in an uncertain world.
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Neorealism Emergence: Kenneth Waltz's Theory of International Politics in 1979
The emergence of neorealism as a distinct theoretical framework in international relations is closely associated with Kenneth Waltz's seminal work, *Theory of International Politics*, published in 1979. This book marked a significant shift in the study of international politics by systematizing and refining the core principles of political realism, which had been a dominant perspective since the early 20th century. While classical realism, as articulated by thinkers like Hans Morgenthau, focused on human nature and state behavior, Waltz's neorealism shifted the focus to the structure of the international system itself. This structural approach became the cornerstone of neorealism, distinguishing it from its predecessor and setting the stage for its emergence as a major paradigm in international relations theory.
Waltz's neorealism, often referred to as structural realism, argues that the international system is anarchic, meaning there is no central authority above states. In this anarchic structure, states are the primary actors, and their behavior is driven by the need for survival in a self-help system. Waltz posited that the distribution of capabilities among states, particularly the number of great powers, shapes the structure of the international system and, consequently, state behavior. This structural explanation of international politics was a departure from classical realism's emphasis on human nature and domestic factors, offering a more systematic and parsimonious theory of international relations.
The publication of *Theory of International Politics* in 1979 is widely regarded as the starting point of neorealism's emergence as a distinct theoretical approach. Waltz's work provided a clear and coherent framework that explained international outcomes through the lens of systemic constraints rather than state-specific characteristics. By focusing on the structure of the international system, Waltz offered a theory that was both generalizable and testable, appealing to scholars seeking rigorous and scientific explanations of international politics. This structural focus also allowed neorealism to address broader patterns of state behavior, such as the balance of power and the security dilemma, in a way that classical realism could not.
Neorealism's emergence in 1979 was also a response to the challenges posed by alternative theories, particularly liberalism and radicalism, which were gaining traction in the 1970s. Waltz's work sought to reassert the primacy of realism by providing a more robust theoretical foundation. By grounding his theory in the immutable structure of the international system, Waltz argued that neorealism could explain historical and contemporary international politics more effectively than its competitors. This defensive and offensive intellectual move solidified neorealism's position as a leading paradigm in the field of international relations.
In conclusion, the emergence of neorealism is inextricably linked to Kenneth Waltz's *Theory of International Politics* in 1979. By shifting the focus from human nature to the structure of the international system, Waltz provided a systematic and innovative framework that redefined political realism. This structural approach not only distinguished neorealism from classical realism but also established it as a dominant perspective in the study of international relations. Waltz's work remains a foundational text, influencing generations of scholars and shaping debates about the nature of global politics. Thus, 1979 marks a pivotal moment in the evolution of political realism, signaling the rise of neorealism as a distinct and enduring theoretical tradition.
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Frequently asked questions
Political realism as a distinct theory in international relations began to take shape in the early 20th century, with significant contributions from thinkers like Hans Morgenthau in the 1940s.
Thucydides, the ancient Greek historian, is often regarded as the founding father of classical political realism due to his pragmatic analysis of power and state behavior in "History of the Peloponnesian War."
Modern political realism gained prominence in the mid-20th century, particularly after World War II, as scholars and policymakers sought to understand the realities of power politics in a post-war world.
Yes, political realism has roots in ancient and classical thought, with figures like Machiavelli in the Renaissance and Hobbes in the 17th century contributing to its foundational ideas about power, statecraft, and human nature.

























