Acknowledgements -- 1. Editor’s Introduction -- Part One: Antiquity and Modernity -- 2. Cosmópolis or koinópolis - what's the difference? -- 3. Human Nature, Democracy and the United States of Europe - Gunnar Landtman (1878 - 1940) on United Europe -- 4. The Idea of Europe in the “Age of Ideologies” (1929-1939): the importance of a forgotten issue -- Part Two: Patriotic Commitment and C…