Dr Alfonso J. García-Osuna is a professor at Hofstra University in the United States. In this article he describes the unexpected resurgence of nationalism, a revival that is irreconcilable with the prognoses of well-known intellectuals. This “ideological poison”, as German President Frank-Walter Steinmeier has portrayed nationalism, is experiencing a popularity not seen since the 1930’s. The dangers posed by this resurgence are best explained by George Santayana’s famous dictum: “Those who cannot remember the past are condemned to repeat it”.