From Mad Men to MAGA: how nostalgia came to be and why we are so eager to indulge it. From movies to politics, social media posts to the targeted ads between them, nostalgia is one of the most potent forces of our era. On Nostalgia is a panoramic cultural history of nostalgia, exploring how a force that started as a psychological diagnosis of soldiers fighting far from home has come become a quintessentially modern condition...