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It’s Time to Start Worrying About a Frexit

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An anti-European Union protester with a sign that roughly translates to "Frexit you excite me." (It sounds better in French.) Loic Venance — AFP/Getty Images

“Brexit” has made it clear that Europe’s postwar trend toward integration is no historical inevitability. Crises once dismissed as mere speed bumps on the road to an ever closer union now have the potential to unravel the project even further. The stakes are high: Brexit involves renegotiating a few trade deals, but if a country that uses the euro leaves the union, the world economy may have a real meltdown to deal with. Here, the three votes that are keeping EU leaders up at night.

1. Auxit

The first challenge to the EU since Brexit is right around the corner. Austria must rerun the presidential runoff vote between the anti-immigrant Freedom Party’s Norbert Hofer and the liberal former Green Party leader Alexander Van der Bellen on Oct. 2. With only 8 million people and a GDP one-tenth the size of Germany’s, Austria couldn’t bring the EU down directly, but its disenchantment with established parties and popular anger at the management of the migrant crisis make it a microcosm of the angst that could spell the union’s downfall.

2. Quitaly

Italy is likely to hold a referendum on electoral reform in late November. It’s not an exit vote per se, but like former U.K. leader David Cameron, Prime Minister Matteo Renzi may find that it mutates into a plebiscite—in Italy’s case on a status quo dominated by stagnation, chronic unemployment, and an increasingly acute banking crisis. Renzi has pledged to resign if the tally doesn’t go his way, and the Five Stars Movement, which wants Italy out of the eurozone, stands waiting to exploit the situation.

For more on the effects of Brexit, watch this Fortune video:

3. Frexit

The EU might—just—survive an Italian-led assault on the eurozone. It could not conceivably survive in its current form if France elects National Front leader Marine Le Pen to the presidency next May. Le Pen is campaigning for a wholesale renegotiation of the EU’s treaties, restoring the primacy of national law, declawing the European Central Bank, ending free movement, and effectively killing the Single Market.

A version of this article appears in the September 1, 2016 issue of Fortune.