Thucydides Trap

Thucydides's diagnosis and the origins of the concept

In Book 1, chapter 23 of his History of the Peloponnesian War, Thucydides wrote that what made war inevitable was the growth of Athenian power and the fear this caused in Sparta. He distinguished immediate triggers, such as the disputes over Corcyra and Potidaea, from deeper structural causes, a distinction that became a classic analytical framework in international relations. Kagan (1969), however, countered that the war was not structurally inevitable and that the poor choices of leaders on both sides were decisive. Allison (2017) applied the diagnosis to the modern era, reviewing 16 cases over the past 500 years in which a rising power challenged a ruling one. He argued that 12 ended in war and 4 avoided it. He presented this as a warning rather than a destiny, stressing that the United States and China would need conscious effort to escape the trap.

Power transition and hegemonic war theories

The Thucydides trap can be seen as a popular rendering of long-standing scholarly theories. Organski (1958) proposed power transition theory, in which differing rates of industrialization shift the distribution of power, and the risk of war peaks when a dissatisfied challenger approaches parity with the dominant state. Organski and Kugler (1980) tested it empirically, and Tammen and colleagues (2000) applied it to 21st-century strategy. Gilpin (1981) argued that when a hegemon that has upheld the international order declines, the order is reshaped through hegemonic war, an idea closely tied to hegemonic stability theory. Levy (1987) and Copeland (2000) focused instead on the preventive motive of a declining power seeking to defeat a rival before it is too late. Mearsheimer's (2001) offensive realism likewise predicted intensifying security competition between a rising China and the United States, linking to the logic of the security dilemma.

Critiques and debate

In a critical review of power transition theory, Lebow and Valentino (2009) pointed out that historical power transitions were more often the result of wars than their cause, and that many were in fact peaceful. Chan (2020) reexamined Allison's case selection and coding and argued that the causal link between power transitions and war has been overstated. Johnston (2003) questioned the very premise that China is a revisionist state seeking to overturn the existing international order wholesale. Others argue that nuclear deterrence, economic interdependence and international institutions set the present apart from past cases. Even so, the concept has become one of the most widely cited frameworks in policy debates over US–China relations and a major arena in which neorealism and liberal theories of international politics compete.

FAQ

What is the Thucydides trap in simple terms?

It's the danger that a rising power and an established power, each fearing the other as their positions are about to flip, slide into war. The name comes from the war between ancient Athens and Sparta.

Is war between a rising power and a ruling power inevitable?

Allison himself stressed that it isn't. Some of his cases avoided war, and critics point out that nuclear deterrence and economic interdependence make today different, and that his case selection may be biased.

Sources reviewed: 2026-10-26

References

1. Thucydides. (1972). History of the Peloponnesian War (R. Warner, Trans.; M. I. Finley, Intro.). London: Penguin. (Original work c. 400 BCE)
2. Kagan, D. (1969). The Outbreak of the Peloponnesian War. Ithaca, NY: Cornell University Press.
3. Organski, A. F. K. (1958). World Politics. New York: Alfred A. Knopf.
4. Organski, A. F. K., & Kugler, J. (1980). The War Ledger. Chicago: University of Chicago Press.
5. Gilpin, R. (1981). War and Change in World Politics. Cambridge: Cambridge University Press.
6. Levy, J. S. (1987). Declining power and the preventive motivation for war. World Politics, 40(1), 82–107.
7. Tammen, R. L., Kugler, J., Lemke, D., Stam, A. C., Abdollahian, M., Alsharabati, C., Efird, B., & Organski, A. F. K. (2000). Power Transitions: Strategies for the 21st Century. New York: Chatham House.
8. Copeland, D. C. (2000). The Origins of Major War. Ithaca, NY: Cornell University Press.
9. Mearsheimer, J. J. (2001). The Tragedy of Great Power Politics. New York: W. W. Norton.
10. Johnston, A. I. (2003). Is China a status quo power? International Security, 27(4), 5–56.
11. Lebow, R. N., & Valentino, B. (2009). Lost in transition: A critical analysis of power transition theory. International Relations, 23(3), 389–410.
12. Allison, G. (2017). Destined for War: Can America and China Escape Thucydides's Trap? Boston: Houghton Mifflin Harcourt.
13. Chan, S. (2020). Thucydides's Trap? Historical Interstate Conflicts and Power Transitions. Ann Arbor: University of Michigan Press.