History has a pattern that almost nobody wants to acknowledge. When a rising power challenges a ruling one, the result is war, not always, but in twelve out of sixteen cases over the last five hundred years. Graham Allison gave this pattern a name. And in doing so, he reframed the most important geopolitical question of our time.
When the Chinese economy overtook Japan to become the second largest in the world in 2010, most Western commentary treated it as a milestone of development, a story of modernisation, of hundreds of millions lifted from poverty, of markets opening and opportunity expanding.
What few commentators paused to consider was the strategic implication sitting quietly inside that headline: for the first time in living memory, a non-Western, non-democratic power was accumulating the economic foundation necessary to challenge American primacy on a global scale. The rules of the game, which the United States had written and refereed since 1945, were about to face a challenge unlike anything they had been designed to absorb.
Thucydides Trap
In moments like these, when the present grows too vast and too swift to comprehend from within, serious minds turn to history for a framework of understanding. They look for the thinker who has already asked the question, who has already done the work of running current events against the long record of the past. In the case of the US-China confrontation, and increasingly in the case of every major power collision playing out across the world today, that thinker is Graham Allison. And the framework he built, the Thucydides Trap, has become perhaps the single most cited concept in contemporary geopolitical analysis.
It is a framework that heads of government have invoked in speeches, that military planners study in war colleges, and that journalists reach for when they need a sentence to hold the enormity of what is at stake between Washington and Beijing. It is also, like all serious frameworks, considerably more careful and more nuanced than the way it is usually summarised. Understanding what Allison actually argued, and what he did not, matters more now than it ever has.
The Man Who Counted the Wars
Graham Allison was born in 1940 in Charlotte, North Carolina. He studied at Davidson College before going to Oxford as a Rhodes Scholar and then to Harvard, where he completed his doctorate and spent the bulk of his remarkable career. He served as Dean of Harvard’s Kennedy School of Government for a decade and a half, transforming it into one of the world’s leading institutions for the study of public policy and international affairs, and served as Assistant Secretary of Defence under President Clinton. He is, in the truest sense, a figure of the American foreign policy establishment: academically rigorous, institutionally connected, and deeply invested in the question of how the United States can manage its power wisely.
His earlier work had already secured his place in the canon before he turned to China. His 1971 book Essence of Decision, a forensic analysis of the Cuban Missile Crisis, is still one of the most widely taught texts in international relations, notable for introducing the idea that government decisions are not the product of a single rational actor but of bureaucratic processes, organisational routines, and inter-agency bargaining that can produce outcomes no one individually intended or desired. It was a profound early lesson in the gap between what states appear to decide and what actually drives their behaviour, a lesson that would inform everything Allison wrote afterwards.
By the time he turned his full attention to the rise of China and the future of American power, he had spent decades at the intersection of academic rigour and real-world policy. He was not building a theory for the seminar room. He was building a warning for the people who make the decisions.
Back to Thucydides
The concept around which Allison built his framework originates not in any modern theory of international relations but in the oldest work of strategic history in the Western tradition. Thucydides was an Athenian general who lived through and wrote about the Peloponnesian War, the catastrophic conflict between Athens and Sparta that consumed the Greek world in the fifth century BC. His account of why that war happened contains a sentence that Allison would place at the centre of everything: it was the rise of Athens and the fear that this instilled in Sparta that made war inevitable.
Allison took this insight and tested it systematically against five centuries of historical cases. He and his research team at Harvard identified sixteen instances since 1500 where a rising power had challenged a ruling power. In twelve of those sixteen cases, the result was war. The four cases that avoided war, including the United States gradually supplanting Britain as the dominant global power in the late nineteenth and early twentieth centuries, were the exceptions that required specific explanation, not the rule. The rule was conflict. The rule was what Allison named the Thucydides Trap: the structural stress that occurs when a rising power threatens to displace a ruling one, generating fear, miscalculation, and escalation dynamics that can pull both sides toward war even when neither side wants it.
The Theory, Plainly Stated
Destined for War, published in 2017, is the full elaboration of this argument applied to the US-China relationship. Allison is careful from the outset to say that destined does not mean inevitable. The title is deliberately provocative, not deterministic. He argues that the structural conditions of the Thucydides Trap are clearly present in the US-China relationship, and that without conscious, deliberate, historically informed statecraft on both sides, the probability of conflict is dangerously high. He is not predicting war. He is diagnosing a condition that historically precedes war, and asking whether this time can be different.
The mechanism he describes is precise.
As China’s power grows, it develops interests that extend beyond its borders, in the South China Sea, in Taiwan, in trade routes, and in the governance of global institutions. These expanding interests inevitably collide with American positions built over decades of unchallenged primacy. Each collision generates domestic political pressure on both sides, in Washington to resist Chinese assertiveness, in Beijing to demonstrate that China will not be contained. Each incident of friction, a naval confrontation, a trade dispute, a technology restriction, a diplomatic humiliation, raises the domestic political cost of backing down, making escalation easier and de-escalation harder. This is the trap. Neither side needs to be aggressive or irrational. The structural dynamics of hegemonic transition are sufficient to generate the conditions for catastrophe.
Crucially, Allison also examines the four cases where war was avoided, asking what those cases have in common. He concludes that avoiding the trap requires something rare and demanding: leaders on both sides who understand the structural danger, who are willing to make concessions that appear domestically costly, who manage their own hawks and nationalists, and who invest in the kind of sustained diplomatic engagement that builds enough mutual understanding to prevent miscalculation from becoming catastrophe.
He points to the Anglo-American transition as the most instructive precedent, a case where shared culture, sustained dialogue, and strategic restraint allowed the most powerful handover in modern history to proceed without war. Whether any of those conditions exist in the US-China relationship today is, he acknowledges, an open and deeply troubling question.
A Warning That Has Only Grown Louder
Since Destined for War was published, the trajectory of US-China relations has moved in almost every direction Allison warned about: trade wars, technology decoupling, military posturing in the South China Sea and around Taiwan, mutual accusations of bad faith, and domestic political incentives on both sides that reward confrontation over compromise. The checklist of Thucydides Trap dynamics reads, today, like a description of the daily news rather than a theoretical scenario.
Allison has continued to write, lecture, and engage policymakers with increasing urgency. He has noted with evident concern that the diplomatic infrastructure for managing US-China tensions, the back-channels, the crisis communication lines, and the sustained personal relationships between officials have deteriorated significantly since his book was published. He has also observed that the domestic political environment in both countries now makes the kind of statecraft required to escape the trap considerably harder than it was even a decade ago. Leaders on both sides face publics that have been primed to see the other as a threat, and institutions that reward toughness over nuance.
What makes Allison’s contribution distinctive is its method. Where Fukuyama reasoned from philosophy, Huntington from cultural observation, and Mearsheimer from structural logic, Allison reasoned from data, from the actual historical record of what great powers do when they find themselves in this position.
His is not a theory of what should happen or what must happen. It is a pattern recognition exercise conducted with scholarly rigour, producing a warning grounded not in ideology but in the accumulated evidence of five centuries of human conflict. In a moment when the Pacific is growing more dangerous by the month, and the decisions being made in Washington and Beijing carry consequences for every person alive, that warning deserves to be heard, carefully, seriously, and without the comforting assumption that this time, somehow, will be different.
(This is the fourth piece of the 8-part series, which was developed collaboratively by the Kashmir Life desk in partnership with Claude, Anthropic’s AI, through a process of shared ideation, research, and writing. Read the first piece here, the second here, the third piece here and the fourth piece here.)
