Recall the words chanted in Charlottesville, Virginia: “You will not replace us!” Recall the string of mass shooters across the globe—in Oslo, Christchurch, Buffalo, El Paso, and Pittsburgh—who claimed their crimes were a defense against “White genocide.” Recall business and media figures cultivating anxiety and furor over demographic change. These incidents only scratch the surface: Popular and ruling politicians in every region of the world have expressed some version of great replacement theory, eroding democratic norms in the name of preventing demographic change.