Rousseau's philosophy of education is contained not only in "Emile" (1762), but also in "The Government of Poland" (1772). In each of them he emphasises different aspects of education: How to be a human being? And: How to be a citizen? The main theme investigated by Rousseau in "The Government of Poland", is how a minor nation surrounded by such major powers as Russia, Prussia and Austria can ensure its survival? Not having the option of defending itself against its powerful neighbours by military means, Rousseau's advice is to found the Polish nation in the hearts of the Polish people, primarily through citizenship education. However, Poland was finally divided between its neighbours in 1795. Rousseau's writing "The Government of Poland" can shed some light on the Danish situation after losing the war to Prussia and Austria in 1864. With its defeat Denmark did not disappear, as did Poland, but the territory of the United Monarchy was almost halved by the loss of the duchies of Schleswig and Holstein. After the war some of the same defence strategies and educational ideas as Rousseau had recommended to Poland became important in Denmark. In light of Rousseau's ideas about citizenship education this article will explore the Danish way of trying to establish the nation in the hearts of the people throughout the 20th century. Today the question is: How to understand the conception of self-determination in the context of establishing European political unity? In his analysis Habermas directs our attention to some of the same dilemmas that Rousseau had dealt with 200 years earlier. Habermas' advice is to give the European spirit a republican form.