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A theory that war becomes likely when a rising power threatens to displace an established ruling power, popularized by political scientist Graham Allison.
The Thucydides Trap is a concept coined by Harvard political scientist Graham Allison, who drew the term from the ancient Greek historian Thucydides. In his History of the Peloponnesian War, Thucydides wrote that "it was the rise of Athens and the fear that this instilled in Sparta that made war inevitable." Allison adapted this observation into a framework for analyzing structural tensions between rising and ruling powers in the international system.
Allison developed the idea in a 2012 Financial Times essay and expanded it in his 2017 book Destined for War: Can America and China Escape Thucydides's Trap?. The book's accompanying Harvard Belfer Center "Thucydides's Trap Case File" examined 16 historical cases over the past 500 years in which a rising power challenged a ruling one. According to Allison's tally, 12 of those rivalries ended in war, while 4 did not — suggesting that war is a strong tendency but not a deterministic outcome.
Key dynamics Allison identifies include:
The framework has been applied most prominently to US–China relations, where some analysts argue Beijing's economic and military ascent generates the same structural pressures Athens once posed to Sparta. Critics, including Arthur Waldron and Joseph Nye, argue the analogy oversimplifies: it relies on a selective reading of Thucydides (who also cited contingent decisions), conflates very different historical cases, and risks becoming a self-fulfilling prophecy if policymakers internalize war as inevitable. Others note that nuclear deterrence, economic interdependence, and international institutions materially alter the conditions Thucydides described.
Harvard political scientist Graham Allison coined it, first popularizing the phrase in a 2012 Financial Times piece and elaborating it in his 2017 book Destined for War.
No. Allison himself stresses that war is not predetermined; he counts 4 of 16 historical rising-versus-ruling-power cases that avoided war, and argues skilled statecraft can prevent escalation.
Critics argue it cherry-picks historical cases, misreads Thucydides by ignoring contingent choices, and may become a self-fulfilling prophecy by framing rivalry as structurally bound for war.