US, China, and the Thucydides Trap: Why Xi used the term, what Trump’s response reveals

At the US-China summit in Beijing on May 14–16, 2026 — the first visit by an American president to China since 2017 — the Chinese side formally raised the co...

What Happened

At the US-China summit in Beijing on May 14–16, 2026 — the first visit by an American president to China since 2017 — the Chinese side formally raised the concept of the "Thucydides Trap," asking whether the two powers could avoid it and "create a new paradigm of major-country relations."
The Chinese leader warned that mishandling the Taiwan question could push the two countries into "clashes and even conflicts."
Key economic outcomes: the two sides established a "Board of Trade" and a "Board of Investment" to manage economic ties; China agreed to purchase at least USD 17 billion per year of US agricultural products and make an initial purchase of 200 Boeing aircraft.
Tariff reductions were notably absent from both sides' official summit summaries, though the US Supreme Court had already struck down portions of existing tariff levies prior to the summit.
Both sides agreed to build a "constructive China-US relationship of strategic stability" as the guiding framework for the next three years.
The invocation of the Thucydides Trap is significant because it signals Beijing's framing of the relationship as a structural — not merely political — contest, rooted in the logic of power transition.

Static Topic Bridges

The Thucydides Trap: Origin and Concept

The term "Thucydides Trap" is derived from the ancient Greek historian Thucydides (c. 460–400 BCE), who wrote the History of the Peloponnesian War — the account of the nearly three-decade conflict between Athens and Sparta (431–404 BCE). Thucydides identified the root cause of the war not in specific incidents, but in structural power dynamics: "It was the rise of Athens and the fear that this inspired in Sparta that made war inevitable."

The modern application of this concept was popularised by American political scientist Graham Allison of Harvard's Belfer Center, who coined the term "Thucydides Trap" and developed it extensively in his 2017 book Destined for War: Can America and China Escape Thucydides's Trap? Allison argues that when a rising power threatens to displace an established hegemon, structural pressures make war the likely outcome — unless both sides take deliberate, difficult actions to avoid it.

Allison examined 16 historical cases over the past 500 years where a rising power challenged an established one: 12 of the 16 ended in war.
The four cases that avoided war (including the US-UK transition in the early 20th century and the Cold War) involved "imaginative statecraft" — deliberate institutional accommodation.
Classical examples include: Athens vs. Sparta (5th century BCE), Habsburgs vs. France (16th century), Britain vs. Germany (WWI), US vs. Japan (WWII).
Allison's Belfer Center maintains a publicly available Thucydides's Trap Case File documenting all 16 cases.

Connection to this news: Beijing's invocation of the trap during the summit was a deliberate diplomatic signal — framing the US-China contest as historically inevitable unless both sides consciously choose accommodation, and simultaneously placing the burden of avoiding war as a shared responsibility (not Chinese aggression).

Power Transition Theory in International Relations

Power Transition Theory, developed by political scientist A.F.K. Organski in 1958, holds that wars are most likely when a challenger approaches the power of the dominant state — not when the dominant state is overwhelmingly stronger. This contrasts with Balance of Power theory (which holds that military parity prevents war) and provides the theoretical foundation for the Thucydides Trap framework.

Organski's original formulation: war occurs when a rising power reaches approximately 80% of the dominant power's capabilities.
Key variable: rate of rise — faster-rising challengers create greater instability.
Structural Realism (Kenneth Waltz) similarly holds that the bipolar structure of the international system — two great powers competing for primacy — generates systemic pressures toward conflict regardless of individual leaders' intentions.
Offensive Realism (John Mearsheimer) argues that great powers always seek to maximise relative power and that a rising China will inevitably challenge US hegemony — making conflict the structural default.

Connection to this news: The Xi-Trump summit revealed both sides attempting to manage power transition dynamics through institutional mechanisms (the new trade and investment boards), while simultaneously not resolving core structural disputes (Taiwan, tariffs, chip war, AI competition) — consistent with what IR theorists describe as "managed rivalry."

US-China Strategic Competition: Key Flashpoints (2022–2026)

The US-China rivalry has moved beyond trade disputes into technology, military, and normative domains. Key flashpoints include:

Semiconductor export controls: The US has progressively tightened restrictions on advanced chip exports to China (October 2022, October 2023, further rounds in 2024–2025), including banning ASML from exporting EUV lithography machines to China. The US has also restricted Nvidia's A100/H100 AI chips to China.
Taiwan Strait: The US maintains a policy of "strategic ambiguity" on Taiwan under the Taiwan Relations Act (1979) — neither explicitly committing to military defence nor abandoning Taiwan. China considers Taiwan a core sovereignty issue under UN Resolution 2758 (1971).
South China Sea: China claims approximately 90% of the South China Sea through its "Nine-Dash Line" claim, rejected by the Permanent Court of Arbitration (PCA) in 2016 (Philippines v. China). The US conducts Freedom of Navigation Operations (FONOPs) in contestation of these claims.
AI and Technology: Both countries are racing to achieve leadership in AI, quantum computing, biotechnology, and 6G — domains seen as determining 21st-century military and economic power.
Rare Earths: China controls approximately 60% of global rare earth mining and 85% of processing — a leverage point it has used in trade disputes. Rare earths are critical for EVs, wind turbines, defence systems, and electronics.

Connection to this news: The summit's failure to resolve tariffs, semiconductor restrictions, or Taiwan — while creating bilateral "boards" — illustrates Allison's point that accommodation without addressing structural power shifts is ultimately insufficient.

China's "New Model of Major Power Relations" Doctrine

China has consistently proposed a framework of "new model of major power relations" (新型大国关系) since approximately 2012, which it defines as: no conflict or confrontation, mutual respect, and win-win cooperation. This framing explicitly rejects the historical pattern of great power rivalry and war. Critics argue it is designed to legitimate China's continued rise while deterring US containment efforts.

The concept was first articulated publicly during the Obama-Xi summit in Sunnylands, California, June 2013.
China's conceptual vocabulary in IR includes "Community of Common Destiny for Mankind" (人类命运共同体), proposed at the UN General Assembly in 2015, and inserted into the PRC Constitution in 2018.
China's position contrasts with the US approach of "managed competition" (Biden era) and "deal-making competition" (Trump era), neither of which accepts Chinese framing of bilateral equivalence.
The invocation of the Thucydides Trap at the Beijing summit represents China merging Western IR theory with its own diplomatic messaging — a deliberate soft power manoeuvre.

Connection to this news: Xi's use of Thucydides during the Trump summit is a rhetorical attempt to frame US-China conflict as avoidable if both sides choose accommodation — effectively asking the US to accept China's rise rather than resist it.

Criticism of the Thucydides Trap Framework

The framework has faced significant academic criticism relevant for UPSC Mains analytical questions.

Historical determinism critique: The 12/16 statistic is selectively constructed — Allison chose which rivalries count as "Thucydides cases," creating confirmation bias.
Structural differences: The Athens-Sparta rivalry involved territorial great powers with largely military contestation. US-China rivalry involves trade dependence (bilateral trade over USD 600 billion/year), nuclear deterrence, multilateral institutions, and non-state actors — making direct military conflict far more costly and complex.
Nuclear deterrence: Both the US and China are nuclear-armed states; Mutually Assured Destruction (MAD) significantly changes the calculus of great power war compared to 5th-century BCE Greece.
Economic interdependence: The US and China are deeply economically integrated; decoupling would be enormously costly for both — a structural peace incentive absent in the Peloponnesian War.
Institutional constraints: The UN Charter's prohibition on the use of force (Article 2(4)), WTO dispute resolution, and multilateral financial institutions create friction against armed conflict that did not exist in antiquity.

Connection to this news: The Lowy Institute and other analysts noted that Trump's response to Xi's Thucydides framing was transactional rather than structural — focusing on specific deals (Boeing, agriculture) rather than accepting or rejecting the paradigm — which may reflect the limits of the classical framework in modern great power management.

Key Facts & Data

Thucydides: ancient Athenian historian, c. 460–400 BCE; wrote History of the Peloponnesian War.
Peloponnesian War: 431–404 BCE, between Athens (rising power) and Sparta (established hegemon).
Graham Allison's book: Destined for War (2017), Harvard Belfer Center; coined "Thucydides Trap."
Historical cases examined by Allison: 16; ended in war: 12 of 16 (75%); avoided war: 4 of 16.
Xi-Trump Beijing summit: May 14–16, 2026 — first US presidential visit to China since 2017.
Summit outcomes: US-China "Board of Trade" and "Board of Investment" established; China to buy USD 17 billion/year in US agriculture and 200 Boeing aircraft.
US tariff restrictions on advanced chips to China: began October 2022 (including ASML EUV export ban).
Taiwan Relations Act: enacted 1979; codifies US "strategic ambiguity" on Taiwan.
UN Resolution 2758 (1971): replaced Republic of China with People's Republic of China in the UN, including the Security Council seat.
PCA ruling on South China Sea (Philippines v. China): July 2016; rejected China's Nine-Dash Line claim.
China's rare earth processing share: approximately 85% of global processing capacity.
"New Model of Major Power Relations" first articulated: June 2013, Sunnylands summit.
China's "Community of Common Destiny for Mankind" inserted into PRC Constitution: 2018.
A.F.K. Organski's Power Transition Theory: first published 1958.