Since then, the convergence between the center right and the far right in Europe has gone further. The lesson that center-right parties drew from the rise of right-wing populism was that they needed to adopt some of its rhetoric and policies. Conversely, some far-right parties have become more moderate, albeit in a selective way. At a national level, parties from the two camps have governed together, both formally, as in Austria and Finland, and informally, as in Sweden.

Yet the most striking illustration of this convergence is the harmonious relationship between the European center right and Giorgia Meloni, the leader of the post-fascist Brothers of Italy, who became prime minister of Italy last year. As soon as she indicated that she would not disrupt the bloc’s economic policy and would be supportive of Ukraine, the European People’s Party was willing to work with her — and its leader, Manfred Weber, even sought to form an alliance with her. The center right, it turns out, doesn’t have a problem with the far right. It just has a problem with those who defy E.U. institutions and positions.

The two, in fact, can agree on a lot — something that plays out most clearly in immigration policy. In contrast to its progressive image, the European Union has, like Donald Trump, sought to build a wall — in this case, in the Mediterranean — to stop migrants from arriving on its shores. Since 2014, more than 28,000 people have died there as they desperately tried to reach Europe. Human Rights Watch said earlier this year that the bloc’s policy could be summed up in three words: “Let them die.”

The European Union’s distinctive approach to migration depends on what might be called the offshoring of violence. Even as it has welcomed millions of Ukrainian refugees, the bloc has paid authoritarian regimes in North African countries to stop migrants from sub-Saharan Africa from reaching Europe, often brutally. Through this grotesque form of outsourcing, the union can continue to insist that it stands for human rights, which is central to its self-image. In this project, the center right and far right are in lock step. In July, Ms. Meloni joined the head of the European Commission, the bloc’s executive arm, and the Dutch prime minister to sign one such deal with Tunisia.

The blurring of boundaries between the center right and the far right is not always as easy to spot as it is in the United States. Partly that’s because the process, taking place in the complex world of the bloc, is subtle. But it is also because of a simplified view of the far right as nationalists, which makes them seem incompatible with a post-national project like the European Union. Yet today’s far right speaks not only on behalf of the nation but also on behalf of Europe. It has a civilizational vision of a white, Christian Europe that is menaced by outsiders, especially Muslims.