The Palace of Culture and Science is illuminated in Union Jack colors by Warsaw's capital authorities in support of Britain staying in the EU, in Warsaw, Poland June 22, 2016.
Kacper Pempel / Reuters

To paraphrase Karl Marx, a specter is haunting Europe this week—the specter of disintegration. The United Kingdom’s referendum on June 23, and the often-vitriolic campaign that has preceded it, has opened Pandora’s box. If the British vote to leave the EU on Thursday, they will kill the illusion that the process of European integration is irreversible. It would further stir the slumbering beast of nationalism in Europe, which reawakened after the Great Recession and the euro crisis. And it will leave Europe’s member states deeply divided over the future path of EU integration.

Undoubtedly, some euro federalists

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