Defence date: 12 November 2012Examining Board: Professor Friedrich V. Kratochwil, formerly EUI, Supervisor; Professor Robert L. Howse, New York University School of Law (CoSupervisor); Professor Susanne K. Schmidt, Bremen International Graduate School of Social Sciences; Professor Sven Steinmo EUI.Dennis-Jonathan Mann’s thesis contributes to a growing body of literature that uses the framework of comparative federalism to “make sense” of the European Union. On an empirical level, the thesis contrasts the EU discourse with an in-depth analysis of two (historic) cases of nature of the Union debates: that of the (early) United States and Canada. Empirically, a core insight of the study is that the puzzle regarding the nature of the EU is large...