Establishment Europe got a rude jolt on Sunday, when the European Union's 360 million citizens registered unprecedented support for far-Right populist parties—conservative nationalist groupings relegated to the fringe only a few years ago. In France, the opposition Rassemblement National (RN) party won more than twice the votes of French President Emmanuel Macron's flagging Renaissance party, prompting the French leader to dissolve the allied parliamentary government and call snap elections later this month. Preliminary polls predict that the far-Right party will come close to winning a majority of National Assembly seats in the forthcoming elections, while Macron's supporters in that body...