The expert survey was made possible by the American Sociological Association’s Fund for the Advancement of the Discipline Award, supported by the American Sociological Association and the National Science Foundation.

For comments and suggestions about the project at various stages of its development we thank John Breuilly, John L. Campbell, Liah Greenfeld, John Hall, Sara Helms, John Stone, Andreas Wimmer, as well as participants at the annual meeting of the Southern Economic Association in November, 2015 and in the workshop of the Department of Sociology and Anthropology at Washington and Lee University.  We presented an early paper proposing the use of an expert survey to generate estimates of the longevity of national identity at the annual meetings of the Eastern Sociological Society and the Midwest Political Science Association in 2012.  We thank the audience at those presentations for their comments.

We are grateful to Anna Milewski for her work as a Research Assistant on the project.  We also thank our three sub-regional consultants, who made recommendations about polity experts: Brian Porter-Szucs, Jelena Subotic, and Scott Radnitz.

Expert survey respondents were offered the option of confidentiality.  As such, we only acknowledge here those respondents who did not elect confidentiality.  However, we are grateful to all of our respondents.

Anton Pelinka, Central European University; Brian Porter-Szucs, University of Michigan; Gary B. Cohen, University of Minnesota; Guntis Smidchens, University of Washington; Clive Hilborne Church, University of Kent; Katja Wezel, University of Pittsburgh; Evan Burr Bukey, University of Arkansas; Paolo Dardanelli, University of Kent; Jelena Subotic, Georgia State University; Michelle Facos, Indiana University; Patrik Hall, Malmö University; Mikael Hjerm, Umeå University; Erika Harris, University of Liverpool; Brendan O’Leary, University of Pennsylvania; Karmen Erjavec, University of Ljubljana; Jelena Dzankic, European University Institute; Gezim Krasniqi, University College London; William Bartlett, London School of Economics; Antal Orkeny, Eötvös Loránd University (ELTE); Anna Triandafyllidou, European University Institute; Nicole Lindstrom, University of York; Adam Hudek, Slovak Academy of Sciences; William Safran, University of Colorado-Boulder; Carl J. Strikwerda, Elizabethtown College; Robert Paul Tombs, Cambridge University; Montserrat Guibernau, Queen Mary University of London; Pasi Ihalainen, University of Jyvaskyla; John Agnew, University of California – Los Angeles; Min Reuchamps, Université catholique de Louvain; Øyvind Østerud, University of Oslo; Martina Topic, Leeds Beckett University; Boyka M Stefanova, University of Texas at San Antonio; Anita Peti-Stantic, University of Zagreb; Emil Aslan Souleimanov, Charles University; Stuart J. Kaufman, University of Delaware; Christian Karner, University of Nottingham; Eleonora Naxidou, Democritus University; Petr Pabian, University of Pardubice; Thoroddur Bjarnason, University of Akureyri; Gísli Sigurðsson, University of Iceland; Steven Sabol, University of North Carolina – Charlotte; Klára Plecitá, Institute of Sociology, Czech Academy of Sciences; William Crowther, University of North Carolina – Greensboro; Aziz Burkhanov, Nazarbayev University; Makuljevic Nenad, University of Belgrade; Sergiu Musteata Ion Creanga State Pedagogical University; Nancy R. Reagin, Pace University; Guy P. Marchal, Universität Luzern; Petar Atanasov, University Ss Cyril and Methodius Skopje; Pietro Vereni, Roma Tor Vergata; Andrej Findor, Comenius University; Mark Jubulis, Gannon University; Kristoffer Rees, Indiana University; Scott Radnitz, University of Washington; Jennifer Todd, University College Dublin; Sergey Minasyan, Caucasus Institute, Yerevan, Armenia; Cory Welt, George Washington University; Anar Valiyev, ADA University; Jeff Sahadeo, Carleton College; Ani Sarkissian, Michigan State University; Georgi Derluguian, New York University Abu Dhabi; Manos Matsaganis, Athens University of Economics and Business; Tassos Anastassiadis, McGill University; Ruby Gropas, European University Institute; Ferran Requejo, Universitat Pompeu Fabra; Davorka Matic, University of Zagreb; Gudmundur Halfdanarson, University of Iceland; Kevin M.F. Platt, University of Pennsylvania; Juraj Marušiak , Solvak Academy of Sciences; Oliver Strijbis, Social Science Center Berlin (WZB); Yohanan Petrovsky-Shtrn, Northwestern University; Jouni Tilli, University of Jyväskylä; Nurie Garcia, Sciences Po Paris; Aviad Rubin, University of Haifa; Carly Elizabeth Schall, Indiana University Purdue University – Indianapolis; David Chilosi, London School of Economics; Xosé M. Núñez Seixas, LMU – Munich; Rogier van Reekum, Erasmus University Rotterdam; Cholpon Chotaeva, American University of Central Asia; Julie K. Allen, University of Wisconsin; Henrik Meinander, University of Helsinki; Alexander B Murphy, University of Oregon; Philip J. Howe, Adrian College; Marharyta Fabrykant, BSU and NRU HSE; Steve Hoffman, University of St. Thomas; Victor A. Friedman, University of Chicago; Risto Alapuro, University of Helsinki; Michael Baum, University of Massachusetts – Dartmouth; Tomas Balkelis, Vilnius University; Kees Teszelszky, University of Groningen; Károly Halmos, Eötvös Loránd University (ELTE); Martin Klatt, University of Southern Denmark; Etleva Lala, Eötvös Loránd University (ELTE); Joan Davison, Rollins College; Malkhaz Toria, Ilia State University; Ayze Zarakol, University of Cambridge; Alejandro Quiroga, Newcastle University; Sener Akturk, Koc University; Richard Bidlack, Washington and Lee University; Stark Draper, University of Toronto; Orvar Löfgren, University of Lund; Lyn Innes, University of Kent; Robert M. Hayden, University of Pittsburgh; Jon E. Fox, University of Bristol; Robert S. DuPlessis, Swarthmore College; Diethelm Prowe, Carleton College; Pieter M. Judson, European University Institute; Paul Monod, Middlebury College; Thomas Kselman, University of Notre Dame; Lisa Forman Cody, Claremont McKenna College; Sarah Horowitz, Washington and Lee University; Walter L. Adamson, Emory University