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The Thucydides Trap, or Thucydides' Trap, is a term popularized by American political scientist Graham T. Allison to describe an apparent tendency towards war when an emerging power threatens to displace an existing great power as a regional or international hegemon. The term exploded in popularity in 2015 and primarily applies to analysis of China–United States relations. Supporting the thesis, Allison led a study at Harvard University's Belfer Center for Science and International Affairs which found that, among a sample of 16 historical instances of an emerging power rivaling a ruling power, 12 ended in war. That study, however, has come under considerable criticism, and scholarly opinion on the value of the Thucydides Trap concept—particularly as it relates to a potential military conflict between the United States and China—remains divided.

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