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Background Thesis explores the contexts that influence anti-immigrant attitudes in both adolescents and adults, and how contexts influence changes anti-immigrant attitudes in societies over time. Whereas previous research into anti-immigrant attitudes has either focused on micro socialization factors in adolescence, or threat inducing factors in adulthood; this thesis forwards an approach that synthesizes these two ideas. This approach includes four aspects: 1) Macro level contexts influence of prejudice during adolescence 2) Macro contextual factors, not strictly limited to direct competition over resources are important for prejudicial attitudes 3) These contexts are potentially changing over time, and changes in conditions should be related to changes in attitudes, and 4) The effects of these macro contexts on prejudicial attitudes during adolescence cast a long shadow over the rest of people’s lives.

Methods The methods used in this thesis employ a diverse range of datasets from Sweden (YeS), Germany (CILS4EU), the United States (GSS) and Europe (ESS) to measure attitudes towards immigrants. Each of these datasets allow for both comparative and longitudinal analysis with multi-level models, and contextual indicators that expand with each study from classrooms to regions, and finally countries.

Results The findings support the proposed approach. Demographic, economic and attitudinal contexts in adolescence influence attitudes about immigrants. Similarly, changes in contexts over time are also important. In contrast, only historic demographic and economic conditions experienced in adolescence, and contemporary levels of social trust influence attitudes in adults.

Conclusion This thesis makes both a theoretical and empirical contributions to the literature on anti-immigrant attitudes. By combining previous approaches it draws attention to both different types of contexts and when they should be important in relation to anti-immigrant attitudes. It also shows empirical evidence for each aspect of this approach with longitudinal analyses.