Europe’s deglobalization and surging nationalism have echoes of the 1930s. Now it's heading into a major energy crisis.

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With high inflation, soaring energy prices, and slowing economic growth, many economists have drawn comparisons between today’s European economy and that of the 1970s oil crisis.

But while 1970s-style stagflation concerns loom large, another pivotal decade in the continent’s history may help explain today’s economic and political trends: the 1930s.

The decade leading up to World War II was marked by a general climate of fear and anxiety in the West. Economic crises and mass poverty broadened the appeal of populist right-wing parties, and lasting trauma from World War I, combined with the Great Depression, fueled isolationism and nationalist foreign policies.

Today, after the pandemic and the Ukraine War disrupted global supply chains, countries are turning away from globalization, and looking inward once more. And European populism is having a moment in the sun, as citizens take their resentment over a rising cost of living and a bleak economic outlook to the polls.

“This is one thing that's kind of worrying and echoes the 1930s. Namely, this widespread disenchantment with what liberal democracies can do,” Cristina Florea, a historian of Central and Eastern Europe at Cornell University, told Fortune.

Europe’s largest democratic institutions have been able to hold firm, but harsher challenges lie ahead as a mounting energy crisis on the continent has sent prices soaring, and discontent has already begun spilling out onto the streets and sowing divisions between European nations.

“Things could be exacerbated this winter by what's happening in Europe with prices going through the roof and fuel shortages. It will really put Europeans to the test,” Florea said. “What's coming in the following months will tell us how far we are willing to go to back up this vision of democracy.”

Deglobalization eras

The strongest resemblance between now and Europe’s 1930s economy, experts say, is the transition from a highly globalized world to one that is quickly becoming more regionalist.

“The most important similarity is that these are eras of, to some extent, deglobalization,” Mark Harrison, emeritus professor of economics and an economic historian at the University of Warwick in the U.K., told Fortune.

In the 1930s, the fallout from the Great Depression created an era of protectionism: a retreat from international trade around the world, with countries in Europe, Asia, and the Americas creating their own small trade circles.

“The depression just sent one state after another into an economic abyss,” Florea said. “The lessons that different states took from this was that they need to turn towards economic nationalism. That the solution is autarky and to just break off ties. A turn against globalization or global connections.”