The United States is fighting, in some form or another, with almost everyone. America's in a hot war with Iran and a cold war with China and Russia (even if President Trump hasn't figured that out). Trump has ignited various trade wars, and keeps talking up a possible conflict with Cuba. And just for good measure, the president seems still obsessed with grabbing Greenland, which would spark a confrontation with NATO, the most powerful and successful alliance in history'and one supposedly led by Washington. This might seem like a good time for some traditional diplomacy: deploying ambassadors to smooth ruffled feathers, assure friends and warn enemies of American resolve, and work out details on trade and other issues that require professional attention. The problem is that those ambassadors don't exist. As The Wall Street Journal reported last week, the Trump administration has left more than 100 ambassadorships unfilled, including some to important U.S. allies. This is an...
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