A Chinese invasion of Taiwan would strike an instant blow to the world economy and deal long-term damage to the web of allies and partners the U.S. has built over the years, Adm. Sam Paparo, the head of U.S. Indo-Pacific Command, told the Senate Armed Services Committee today. A war over Taiwan would cause a 25% downturn in gross domestic product in Asia, Paparo said, which in turn would plunge domestic GDP by 10% to 12% and spike unemployment by...