This paper analyzes Kenneth Waltz's foundational work Man, the State, and War (1959), examining his three "images" as competing explanations for the causes of war. The first image attributes war to human nature; the second locates its causes in the internal structure of states, with particular attention to liberal capitalism and Marxism-Leninism; and the third argues that international anarchy — the absence of a central authority — is the primary driver of conflict. The paper contrasts Waltz's systemic approach with Morgenthau's pessimism about human nature, and concludes by explaining the security dilemma and its role in generating arms races and war.
The paper demonstrates theoretical triangulation: it presents multiple competing explanatory frameworks for the same phenomenon (war), evaluates the evidence for each, and argues for the superiority of one. This technique is central to IR scholarship and shows the student can engage with theories not just descriptively but critically.
The paper opens by contrasting Waltz with Morgenthau to establish stakes, then proceeds through the three images in order. The second image receives the most space, with detailed treatment of liberal and Marxist-Leninist theory including Lenin's imperialism thesis. The paper closes with the third image, introducing anarchy and the security dilemma as Waltz's core contribution. A single bibliographic entry grounds the analysis in the primary source.
The purpose of Man, the State, and War is to challenge theories that do not locate the causes of war within the international system. Unlike Hans Morgenthau, who does not believe international relations can change because human nature cannot change, Kenneth Waltz argues that by changing the nature of the system, meaningful changes can be made in international relations. To make his case, Waltz presents three hypotheses, or "images," each offering a different explanation for the causes of war.
The first image holds that human nature is the cause of war. If human nature is evil, corrupt, and power-hungry, then the same must be true of state behavior, since states are made up of and governed by people. Bad people do bad things. Because human nature cannot be changed, war cannot be eliminated, and the best we can do is manage conflict through a proper understanding of the balance of power.
The second image holds that the causes of war are found within states — that domestic society conditions human behavior. If so, then different types of social organization should produce different behaviors. Bad states cause war; good states seek peace. Such theories argue that a world composed entirely of democracies, capitalist states, or socialist states would bring peace, while the absence of any one of these systems leads to war.
Waltz does not find sufficient evidence to advocate for one form of state above the others. He cannot establish a causal link between any particular type of state and war. Capitalist states have been imperialistic while authoritarian regimes have sometimes been peaceful, and democracies have fought some of the most violent wars in human history. It is true that capitalist states fight wars, but capitalism does not cause all wars. Likewise, authoritarian states have been known to be aggressive, but not exclusively so. Liberal capitalism and Marxism-Leninism are the two best examples of the second image, and alongside realism they have been the most powerful international relations theories of the twentieth century.
If a government removes all obstructions from the economy — such as tariffs and subsidies — creating a free market, the sympathy principle and the laws of supply and demand will regulate economic activity. To succeed, individuals will work, invest, and invent to satisfy needs revealed by the market, competing with others to secure as much wealth as possible. The economy is regulated by the laws of supply and demand, with investment and labor moving into sectors where profits are to be made and out of sectors where opportunities have been exhausted.
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