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Catalyst or Crown: Does Naturalization Promote the Long-Term Social Integration of Immigrants?



We study the impact of naturalization on the long-term social integration of immigrants into the host country society. Despite ongoing debates about citizenship policy, we lack reliable evidence that isolates the causal effect of naturalization from the nonrandom selection into naturalization. We exploit the quasi-random assignment of citizenship in Swiss municipalities that used referendums to decide on naturalization applications of immigrants. Comparing otherwise similar immigrants who narrowly won or lost their naturalization referendums, we find that receiving Swiss citizenship strongly improved long-term social integration. We also find that the integration returns to naturalization are larger for more marginalized immigrant groups and when naturalization occurs earlier, rather than later in the residency period. Overall, our findings support the policy paradigm arguing that naturalization is a catalyst for improving the social integration of immigrants rather than merely the crown on the completed integration process.


Corresponding author

Jens Hainmueller is Professor, Department of Political Science and Graduate School of Business, Stanford University, 616 Serra Street, Stanford, CA 94305, and Immigration Policy Lab, Stanford University, 616 Serra Street, Stanford, CA 94305, and University of Zurich, Affolternstrasse 56, 8050 Zurich (
Dominik Hangartner is Associate Professor, Department of Government, London School of Economics, Houghton Street, London WC2A 2AE, and Faculty Co-Director, Immigration Policy Lab, Stanford University, 616 Serra Street, Stanford, CA 94305, and University of Zurich, Affolternstrasse 56, 8050 Zurich (
Giuseppe Pietrantuono is Postdoc, Immigration Policy Lab, Stanford University, 616 Serra Street, Stanford, CA 94305, and University of Zurich, Affolternstrasse 56, 8050 Zurich (


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Funding for this research was generously provided by Swiss National Science Grant No. 100017_143534 and the Ford Foundation generously provided operational support for the Immigration Policy Lab. We thank Murat Aktas, Dejan Balaban, and Selina Kurer for excellent research assistance, Marc Helbing, David Laitin, and Duncan Lawrence for helpful comments, and our respondents for answering our survey. The usual disclaimer applies.



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Achen, Christopher H. 1975. “Mass Political Attitudes and the Survey Response.American Political Science Review 69 (4): 1218–31.
Aleinikoff, T. Alexander, and Klusmeyer, Douglas. 2011. Citizenship Policies for an Age of Migration. Washington D.C.: Carnegie Endowment.
Algan, Yann, Bisin, Alberto, Manning, Alan, and Verdier, Thierry. 2012. Cultural Integration of Immigrants in Europe. New York: Oxford University Press.
Angrist, Joshua D., Imbens, Guido W., and Rubin, Donald B.. 1996. “Identification of Causal Effects using Instrumental Variables.Journal of the American Statistical Association 91 (434): 444–55.
Ansolabehere, Stephen, Rodden, Jonathan, and Snyder, James M.. 2008. “The Strength of Issues: Using Multiple Measures to Gauge Preference Stability, Ideological Constraint, and Issue Voting.American Political Science Review 102 (2): 215–32.
Aptekar, Sofya. 2015. The Road to Citizenship: What Naturalization Means for Immigrants and the United States. New Brunswick, NJ: Rutgers University Press.
Avitabile, Ciro, Clots-Figueras, Irma, and Masella, Paolo. 2013. “The Effect of Birthright Citizenship on Parental Integration Outcomes.Journal of Law and Economics 56 (3): 777810.
Banulescu-Bogdan, Natalia. 2012. “Shaping Citizenship Policies to Strengthen Immigrant Integration.” Migration Policy Institute paper, Washington.
Bauböck, Rainer. 2004. “Civic Citizenship—A New Concept for the New Europe.” Managing Integration: European Union Responsibilities towards Immigrants, Güthersloh: Bertelsmann Foundation 146–63.
Bauböck, Rainer, Ersboll, Eva, Groenendijk, Kees, and Waldrauch, Harald. 2006. Acquisition and Loss of Nationality: Comparative Analyses-Policies and Trends in 15 European Countries. Vol. 1 Amsterdam: Amsterdam University Press.
Bauböck, Rainer, Honohan, Iseult, Huddleston, Thomas, Hutcheson, Derek, Shaw, Jo, and Vink, Maarten Peter. 2013. “Access to Citizenship and its Impact on Immigrant Integration.” Florence: EUDO Citizenship.
Berry, John W. 1997. “Immigration, Acculturation, and Adaptation.Applied Psychology 46 (1): 534.
Bevelander, Pieter. 2000. Immigrant Employment Integration and Structural Change in Sweden, 1970–1995. Dissertation, Lund University.
Bevelander, Pieter. 2011. “Naturalisation and Social Inclusion.” In Naturalisation: A Passport for the Better Integration of Immigrants?, ed. OECD. Paris: OECD Publishing, 210–30.
Bevelander, Pieter, and DeVoretz, Don J.. 2008. The Economics of Citizenship. Malmö: Malmö University (MIM).
Bevelander, Pieter, and Pendakur, Ravi. 2011. “Voting and Social Inclusion in Sweden.International Migration 49 (4): 6792.
Bevelander, Pieter, and Spang, Mikael. 2014. “From Aliens to Citizens: The Political Incorporation of Immigrants.” In Handbook of the Economics of International Migration, 1A: The Immigrants, eds. Barry Chiswick, and Paul Miller. Amsterdam: North-Holland, 443–82.
Bevelander, Pieter, and Veenman, Justus. 2008. “Naturalization and Socioeconomic Integration: The Case of the Netherlands.” In The Economics of Citzienship, ed. Bevelander, Pieter, and DeVoretz, Don. J., Malmö: Malmö University, 6388.
Bloemraad, Irene. 2006. Becoming a Citizen: Incorporating Immigrants and Refugees in the United States and Canada. Berkeley: University of California Press.
Bloemraad, Irene, Korteweg, Anna, and Yurdakul, Gökçe. 2008. “Citizenship and Immigration: Multiculturalism, Assimilation, and Challenges to the Nation-State.Annual Review of Sociology 34 (1): 153–79.
Bratsberg, Bernt, Ragan, James F., and Nasir, Zafar M.. 2002. “The Effect of Naturalization on Wage Growth: A Panel Study of Young Male Immigrants.Journal of Labor Economics 20 (3): 568–97.
Carens, Joseph H. 2005. “The Integration of Immigrants.Journal of Moral Philosophy 2 (1): 2946.
Castles, Stephen, Korac, Maja, Vasta, Ellie, and Vertovec, Steven. 2002. “Integration: Mapping the field.” Home Office Online Report 29/03. London: Home Office.
Chiswick, Barry. 1978. “The Effect of Americanization on the Earnings of Foreign-Born Men.The Journal of Political Economy 86 (5): 897921.
Chiswick, Barry, and Miller, Paul W.. 2009. “Citizenship in the United States: The Roles of Immigrant Characteristics and Country of Origin.Research in Labor Economics 29: 91130.
Dancygier, Rafaela M. 2010. Immigration and Conflict in Europe. New York, NY: Cambridge University Press.
Dancygier, Rafaela M., and Laitin, David D.. 2014. “Immigration into Europe: Economic Discrimination, Violence, and Public Policy.Annual Review of Political Science 17 (1): 4364.
DeSipio, Louis. 1996. “Making Citizens or Good Citizens? Naturalization as a Predictor of Organizational and Electoral Behavior among Latino Immigrants.Hispanic Journal of Behavioral Sciences 18 (2): 194213.
Dustmann, Christian. 1996. “The Social Assimilation of Immigrants.Journal of Population Economics 9 (1): 3754.
Eggers, Andrew, Fowler, Anthony, Hainmueller, Jens, Hall, Andrew B., and Snyder, James M.. 2015. “On The Validity Of The Regression Discontinuity Design For Estimating Electoral Effects: New Evidence From Over 40000 Close Races.American Journal of Political Science 59 (1): 259–74.
Ersanilli, Evelyn, and Koopmans, Ruud. 2011. “Do immigrant Integration Policies Matter? A Three-Country Comparison Among Turkish Immigrants.West European Politics 34 (2): 208–34.
Fetzer, Joel S. 2000. Public Attitudes Toward Immigration in the United States, France, and Germany. Cambridge, UK: Cambridge University Press.
Galston, William A. 2001. “Political Knowledge, Political Engagement, and Civic Education.Annual Review of Political Science 4 (1): 217–34.
Geddes, Andrew. 2003. The Politics of Migration and Immigration in Europe. London: SAGE Publications.
Giddens, Anthony. 2007. “Doubting Diversity's Value.Foreign Policy 163: 86–8.
Goodman, Sara W. 2010. Naturalisation Policies in Europe: Exploring Patterns of Inclusion and Exclusion. Florence: EUDO Citizenship.
Hahn, Jinyong, Todd, Petra, and Klaauw, Wilbert Van der. 2001. “Identification and Estimation of Treatment Effects with a Regression-Discontinuity Design.Econometrica 69 (1): 201–9.
Hainmueller, J., and Hangartner, D.. 2013. “Who Gets a Swiss Passport? A Natural Experiment in Immigrant Discrimination.American Political Science Review 107 (1): 159–87.
Hainmueller, Jens, and Hangartner, Dominik. Forthcoming. “Does Direct Democracy Hurt Immigrant Minorities? Evidence from Naturalization Decisions in Switzerland.” American Journal of Political Science.
Hainmueller, Jens, Hangartner, Dominik, and Pietrantuono, Giuseppe. 2015. “Naturalization Fosters the Long-Term Political Integration of Immigrants.Proceedings of the National Academy of Sciences 112 (41): 12651–6.
Hainmueller, Jens, and Hopkins, Daniel J.. 2014. “Public Attitudes Toward Immigration.Annual Review of Political Science 17: 225–49.
Hooghe, Marc, Reeskens, Tim, Stolle, Dietlind, and Trappers, Ann. 2009. “Ethnic Diversity and Generalized Trust in Europe A Cross-National Multilevel Study.Comparative Political Studies 42 (2): 198223.
Howard, Marc Morjé. 2005. “Variation in Dual Citizenship Policies in the Countries of the EU.International Migration Review 39 (3): 697720.
Jennings, M. Kent, and Niemi, Richard G.. 2014. Generations and Politics: A Panel Study of Young Adults and their Parents. Princeton: Princeton University Press.
Joppke, Christian. 2010. Citizenship and Immigration, Cambridge: Polity Press.
Just, Aida, and Anderson, Christopher J.. 2012. “Immigrants, Citizenship and Political Action in Europe.British Journal of Political Science 42 (3): 481509.
Keller, Nicolas, Gathmann, Christina, and Monscheuer, Ole. 2015. “Citizenship and the Social Integration of Immigrants: Evidence from Germany's Immigration Reforms.” German Economic Association Annual Conference 2015 (Münster): Economic Development - Theory and Policy.
Kesler, Christel, and Demireva, Neli. 2011. “Social Cohesion and Host Country Nationality among Immigrants in West Europe”. In Naturalisation: A Passport for the Better Integration of Immigrants?, ed. OECD. Paris: OECD Publishing, 209–36.
Kristensen, Ewa. 2014. “Methodenbericht zum Indikatorensystem der Integration der Bevölkerung mit Migrationshintergrund.” Technical report, Bundesamt für Statistik.
Mazzolari, Francesca. 2009. “Dual Citizenship Rights: Do they make more and Richer Citizens?Demography 46 (1): 169–91.
McCrary, Justin. 2008. “Manipulation of the Running Variable in the Regression Discontinuity Design: A Density Test.Journal of Econometrics 142 (2): 698714.
OECD. 2012. Settling In: OECD Indicators of Immigrant Integration 2012. Paris: OECD Publishing.
OECD, ed. 2011. Naturalisation: A Passport for the Better Integration of Immigrants? Paris: OECD Publishing.
Oers, Ricky van, and Hart, Betty de. 2006. “European Trends in Nationality Law.” In Acquisition and Loss of Nationality: Policies and Trends in 15 European States, eds. Reiner Bauböck, Eva Ersboll, Kees Groenendijk, and Harald Waldrauch. Amsterdam: Amsterdam University Press, 317–57.
Putnam, Robert D. 2007. “E pluribus unum: Diversity and Community in the Twenty-First century the 2006 Johan Skytte Prize Lecture.Scandinavian Political Studies 30 (2): 137–74.
Soysal, Yasemin. 1994. The Limits of Citizenship. Chicago: University of Chicago Press.
Steinhardt, Max Friedrich. 2012. “Does Citizenship Matter? The Economic Impact of Naturalizations in Germany.Labour Economics 19 (6): 813–23.
Steinhardt, Max Friedrich, and Wedemeier, Jan. 2012. “The Labor Market Performance of Naturalized Immigrants in Switzerland—New Findings from the Swiss Labor Force Survey.Journal of International Migration and Integration 13 (2): 223–42.
Stock, James H., and Yogo, Motohiro. 2005. “Testing for Weak Instruments in Linear IV Regressions.” In Identification and Inference for Econometric Models: Essays in Honor of Thomas J. Rothenberg, eds. Andrews, Donald W.K., and Stock, James H.. New York: Cambridge University Press, 80108.
Turcotte, Yvan. 2011. “Naturalisation and the Promotion of the Social Integration of Immigrants in Quebec.” In Naturalisation: A Passport for the Better Integration of Immigrants?, ed. OECD. Paris: OECD Publishing, 261–73.
Westholm, Anders, Montero, José Ramon, and van Deth, Jan W.. 2007. “Introduction: Citizenship, Involvement, and Democracy in Europe.” In Citizenship and Involvement in European Democracies: A Comparative Analysis, eds. van Deth, Jan W., Montero, José Ramon, and Westholm, Anders. London: Routledge, 132.
Wunderlich, Tanja. 2005. Die neuen Deutschen: subjektive Dimensionen des Einbürgerungsprozesses. Stuttgart: Lucius & Lucius.
Yang, Philip Q. 1994. “Explaining Immigrant Naturalization.International Migration Review 28 (3): 449–77.

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Catalyst or Crown: Does Naturalization Promote the Long-Term Social Integration of Immigrants?



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