And then there were none. The World Trade Organization will lose its final Appellate Body member, China’s Zhao Hong, on Monday, completing the body’s U.S.-forced descent into obsolescence, at least for now. The Trump administration escalated longstanding U.S. concerns with the operation of the Appellate Body in mid-2017 by initiating a block on filling vacancies on the body, arguing that it required significant reform. The U.S. maintains the Appellate Body has been operating well outside its mandate for years and...