Thucydides's Trap

Will the 21^st century be defined by great power war or peace? By prosperity or poverty? The answers depend largely on the course set by Washington and Beijing.

Amid the exchange of threats between North Korea and the United States, ongoing North Korean nuclear and missile tests, and U.S. talk of “all options,” there is growing concern about the real possibility of war with North Korea. What many have not yet reckoned with is an even darker specter. Could events now cascading on the Korean Peninsula drag the U.S. and China into a great-power war?

President Trump appears desperate, erratic and even irrational as he struggles to stop North Korea from developing nuclear weapons capable of reaching the U.S. mainland. If the president is to be believed, he stands ready to run any risk, pay any price and do whatever necessary to keep the U.S. safe. This includes launching a pre-emptive attack that risks dragging America and China into a second Korean War. To understand the method in what looks like madness, recall the Cold War strategy known as “nuclear chicken.”

To mark the 90th birthday of the People’s Liberation Army on Aug. 1, China’s President Xi Jinping went to the Inner Mongolian steppe to the site where Genghis Khan began his conquest of Eurasia. There, at Zhurihe, he was welcomed by an impressive display of China’s martial might: a parade of Chinese troops, tanks, helicopters, aircraft and missiles. But the main course was a massive war game demonstrating the state of China‘s preparation to “fight and win” future military conflicts.

"Since the election of Donald Trump as US president, the probability of a Sino-American conflict has soared. Last year Trump ran an aggressively anti-Chinese election campaign, repeatedly threatening to impose tariffs on Chinese imports. Trade is only one of several bones of contention. America remains committed to freedom of navigation in the South China Sea. China’s island-building programme is designed to make that sea Chinese in fact as well as in name. Trump is less committed than any US president since Richard Nixon to the 'One China' policy, which pretends that Taiwan is not an independent state."

An approach that requires the United States to accept what it longed deemed “unacceptable” will strike many people in Washington as irresponsible.

The defining question about global order for this generation is whether China and the United States can escape Thucydides’s Trap. The Greek historian’s metaphor reminds us of the attendant dangers when a rising power rivals a ruling power—as Athens challenged Sparta in ancient Greece, or as Germany did Britain a century ago. Most such contests have ended badly, often for both nations, a team of mine at the Harvard Belfer Center for Science and International Affairs has concluded after analyzing the historical record. In 12 of 16 cases over the past 500 years, the result was war. When the parties avoided war, it required huge, painful adjustments in attitudes and actions on the part not just of the challenger but also the challenged.