EU leaders who feared that elections in the Netherlands would strengthen the wave of Euroskepticism building across the Continent were soothed by the worse-than-anticipated performance of the populist Party for Freedom. But although most Dutch voters did not embrace the party, the conditions that have fostered the rise of nationalism across Europe are still in place. With the Dutch elections over, those concerned with the future of the eurozone will turn their focus to France, which will hold presidential and legislative elections between April and June. But a potentially bigger threat to continental unity lies in Italy, where a number of political parties want the country to leave the eurozone, and the electoral system may allow them to access political power....