Acknowledgements
We thank the journal editors for their support and advice as well as the referees, who helped strengthen the contributions, and, of course, our contributors. This collection was partly prepared while Lucia Quaglia was a research fellow first at the BIGSSS (University of Bremen) and the Hanse-Wissenschaftskolleg (HWK) and then at the Scuola Normale Superiore (SNS), Florence.
Disclosure statement
No potential conflict of interest was reported by the authors.
Notes on contributors
Simon Bulmer is Professor of European Politics at the University of Sheffield.
Lucia Quaglia is Professor of Political Science at the University of Bologna.