This book explores the intellectual grounds of Scandinavianist ideology and its political development into a national unification movement. Denmark, Norway and Sweden were nearly annihilated during the Napoleonic Wars. The lesson learned was that survival was a matter of size. Whereas their union of 1814 offered Sweden-Norway geostrategic security tempered by fear of Russia, Denmark was the biggest territorial loser of the Napoleonic Wars and faced separatism connected to German nationalism in the duchies of Schleswig and Holstein. This evolved into a national conflict that threatened Denmark’s survival as a nation. Meanwhile, a new generation of Danes, Swedes and Norwegians had come to regard kindred language, culture and religion as a case for Scandinavian union that could offer protection against Russia and Germany. When the European revolutions of 1848 unleashed the First Schleswig War, the influence of Scandinavianism was such that it nearly turned into a Scandinavian war of unification.