Europe’s essential unity is getting stronger

OVER the past 10 years, the European Union has endured a series of unprecedented crises, the likes of which we are unlikely to see again. But other, no less daunting challenges lie ahead, and we would do well to remember the lessons learned along the way.
One lesson is that unity is not an option; it is a condition sine qua non of the EU’s economic prosperity and political relevance. It is remarkable that since 2004, when I became President of the European Commission, the EU’s membership has nearly doubled to 28.