This year has rattled Western politics to their core. The Brexit vote laid bare the deep rifts crisscrossing the Continent, while far-right and anti-establishment parties across Europe have gained momentum. Across the Atlantic, the United States witnessed a similar political upheaval in the surprise November election of Donald Trump as the country's next president. With several more votes scheduled for 2017 in many of the European Union's biggest member states, including France, Germany and now perhaps Italy, next year is shaping up to be just as turbulent as the last....