The West’s romance with multiculturalism is souring. Millions of self-proclaimed nativist groups are hitting the streets—from Australia in the southern hemisphere to Western Europe in the north. The theme is the same: reclaim the nation, keep out immigrants. The latest rally held in London was a war cry against open borders, long a hallmark of Western liberalism.

Most of these rallies, including the one in London, are led by far-right parties whose leaders are self-ascribed white supremacists. Worryingly, these nativists are no longer confined to the margins. Polls show that across........

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