The world's most dangerous flashpoint got much more dangerous Thursday when China sent its lone aircraft carrier into the Taiwan Strait and Taiwan scrambled fighter jets in response. This is how accidental wars start: provocation and counter-provocation in an environment with too much uncertainty. The uncertainty arises from not knowing the Donald Trump administration’s answer to a pressing foreign policy question: Would the U.S. defend Taiwan from a Chinese attack? The answer as a matter of U.S. policy has long been complicated. Legally, the U.S. has no treaty obligation to defend Taiwan, and the Taiwan Relations Act of 1979 says only that the U.S. would view an attack with “grave concern.” Analysts refer to this as a policy of “strategic ambiguity.” In practice, however, the diplomatic and defense establishments have long assumed that the U.S. would defend Taiwan as vigorously as it would Japan or South Korea, with which it has mutual defense treaties -- for the simple reason that...

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