The European Union and Mexico reached an agreement on Saturday on a new free trade deal, a coup for both parties in the face of increased protectionism from the United States under President Donald Trump. Since its plans for a trade alliance with the United States were frozen after Trump’s election victory, the EU has focused instead on trying to champion open markets and seal accords with other like-minded countries. The agreement in principle with Mexico follows a deal struck last year with Japan and comes ahead of talks next week with the Mercosur bloc of Argentina, Brazil, Paraguay and...