To observers and experts alike, the United States’ Taiwan policy is as clear as Joe Biden’s dementia babble. That said, Biden’s episodes of word salad have not prevented him from pledging to defend Taiwan from a Chinese invasion. In fact, since his presidency began, he has promised to do so at least three times. These seemingly definitive statements did not add clarity to U.S. policy–which since 1979 has been described as “strategic ambiguity.” In August 2021, Biden stated that, much like a NATO Article 5 obligation, the U.S. has a “sacred” commitment to defend Taiwan. A few months later,...