Global commerce will lose its ultimate umpire Tuesday, leaving countries unable to reach a final resolution of disputes at the World Trade Organization and instead facing what critics call “the law of the jungle.’’ The United States, under a president who favors a go-it-alone approach to economics and diplomacy, appears to prefer it that way. The terms of two of the last three judges on the WTO’s appellate body neared their end at midnight Tuesday. Their departure will deprive the de facto Supreme Court of world trade of its ability to issue rulings. Among the disputes left in limbo are...