This is just the beginning of Europe's coming nightmare.

Italy Voters Deliver Blow to Battered Euro Project

Volatile trading in the euro after the Italian referendum raises concerns about how the currency survives an era of populist politicians and diverging economies.

• Italy Set for Fresh Bout of Uncertainty After Vote

For Europe’s Unity, 2017 Will Be a Year of Reckoning

Euroskeptic parties vary in their prescriptions but are putting pressure on mainstream politicians to address perceived flaws in the EU and common currency. Elections next year in several European nations will go far to determine the fate of continental integration.

• Analysis: Banks Are Italy’s Immediate Problem