JUST five months after May’s election Belgium has a new government. Set against the 18 months that it took in 2010, that is fast work. Charles Michel, the 38-year-old leader of the French-speaking liberals, will lead a four-way coalition consisting of his party, the Flemish liberals, the Flemish Christian Democrats and—for the first time—the Flemish nationalist N-VA party. As the largest party, the N-VA, led by its bullish leader, Bart De Wever, is now Belgium’s dominant political force. And that shreds nerves among those fearful of the country’s possible break-up.Founded on a platform of separatism, the N-VA has long exploited the deep cultural and linguistic chasm in Belgium. The people of the two biggest regions, Flanders and Wallonia, tend to see themselves as Fleming or Walloon first and Belgian second, if at all. The divide is entrenched in a political system that splits into Dutch- and French-speaking parties.A lattice of federal, regional and municipal governments binds Belgium together, but economic forces are pulling it apart. Belgium’s public debt, at over 100% of GDP, is among the European…