Nostalgia has become a major force in global politics. While Donald Trump hopes to "make America great again," Xi Jinping calls for a "great rejuvenation of the Chinese people," and a majority of Russians still mourn the Soviet Union. But it is Brexit, with its idealization of a bygone era of full sovereignty, that epitomizes nostalgic nationalism in its purest form.
Despite its romantic flavor, nostalgia is a malaise--a combination of paranoia...