Europe and Mexico show the world can trade without the U.S.

Mexico and the European Union agreed to a new trade deal over the weekend, and the timing is no accident. With the French and German leaders in Washington this week, and the Nafta talks getting serious, America’s trading partners are showing that the world won’t stop if the U.S. goes protectionist. The EU-Mexico deal is the sort of trade opening that is increasingly common beyond America’s shores. The two sides have agreed in principle to remove protections on a long list of agricultural goods, and to expand two-way trade...