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Although political radicalism is one of the major societal threats, we have limited understanding of how it is formed. While there are reasons to expect that harassment experienced in adolescence increase the propensity for radicalism, this relationship has not yet been investigated. This five-wave study of Swedish adolescents (N = 892) examined the role of peer harassment in radical political behavior. The results revealed that within-person fluctuations in harassment were positively related to fluctuations in radicalism. Individual-level (but not class-level) harassment also predicted differences between adolescents: youth who experienced more harassment had higher levels of and a more pronounced decrease in radicalism. In addition, adolescents who had more supportive teachers or parents were less affected by harassment than youth with less-supportive adults. The findings suggest that personal experiences of harassment increase the risk of radicalism but supportive relationships can mitigate their negative consequences.

Although previous research has shown that deliberative discussions have consequences for intergroup attitudes, very little is known about this impact during the formative adolescent years. In addition, the mechanism explaining the mechanism through which discussions affect intergroup attitudes is not clear. This 3-wave study of Swedish adolescents (N = 892, 51.1% girls, MageT1 = 13.41, nested in 35 classrooms) examined the role of teacher-initiated political discussions in the classroom for the development of youth attitudes toward immigrants. The results of multilevel analysis showed that adolescents who perceived political discussions to be less frequent increased in anti-immigrant attitudes compared to youth with more frequent discussions. Similarly, classrooms with less deliberative atmosphere were more negative toward immigrants than classrooms with a higher frequency of discussions, and this effect remained two years after the students moved to new schools. Mediation analysis revealed that general political interest (but not news consumption) explained the effects of classroom discussions on attitudes: Youth who perceived that their teachers frequently initiate political discussions developed higher general political interest and, in turn, lower anti-immigrant attitudes than youth with less frequent discussions. The findings show an important role of classroom political discussions for the formation of intergroup attitudes in adolescence. The findings suggest that frequent discussions reduce the risk of prejudice development by stimulating youth general political interest.

Despite ample research on empathy development, its social origins have been understudied, particularly in the context of peer relations. This two-wave study of Swedish adolescents (N = 318; MageT1 = 16.28, SD =.49; 55% females) examined longitudinal associations between youth friendships and empathy. The results showed that adolescents befriended peers with similar levels of empathy and that, controlling for the initial similarity in empathy, youth who had more empathic friends increased in empathy over time compared with youth with less empathic friends. These selection and influence effects were comparable for the affective and cognitive empathy components (i.e., empathic concern and perspective taking). These results provide strong evidence for the role of friendships in the development of empathy. They underscore the importance of peer-based, social-emotional programs to foster adolescent empathy.

Although classrooms have been described as an important socialization agent for the development of intergroup attitudes, the role of classroom climate has rarely been investigated. This 5-wave study of Swedish adolescents (N = 892, 51.1% girls, nested in 35 classrooms) examined the role of cooperative classroom climate for the development of youth attitudes toward immigrants. The results of multilevel analyses showed that adolescents who perceived classroom climate to be more cooperative had lower levels of anti-immigrant attitudes compared to youth who perceived the classroom climate as less cooperative. Similarly, classrooms with a more cooperative climate were more positive toward immigrants than classrooms with a less cooperative climate. In addition, cooperative classroom climate did not moderate the effects of classroom ethnic diversity on youth attitudes. These findings suggest that cooperative classroom climate reduces the risk of prejudice development.

This study examined short- and long-term effects of ethnic classroom diversity for intergroup relations in adolescence. Using a five-year panel of Swedish majority youth (M_ageT1 = 13.40, M_ageT5 = 17.30), we found only limited direct effects of classroom diversity on anti-immigrant attitudes. However, classroom diversity increased the likelihood of cross-ethnic friendships, which in turn was associated with lower levels of anti-immigrant attitudes. Moreover, we found that the effect of classroom diversity on friendships remained also after adolescents transitioned to new schools. The findings highlight the importance of longitudinal analyses and contribute to a deeper understanding of how intergroup relations develop during adolescence. It brings new insights related to the longevity of classroom effects and to cross-ethnic friendships' ability to mediate the diversity–attitudes relationship.

Although several studies have examined outgroup empathy, the link between trait empathy and outgroup attitudes has been underinvestigated. In the present study this link was investigated among two samples of ethnic Dutch preadolescents (N = 335, M-age = 10.83 years, SD = 0.94; 53% girls; N = 326; M-age = 10.53 years, SD = 1.03; 48% girls). It examined children's parallel empathy in relation to their ethnic attitudes, and the moderating role of perceived peer norms. Results (partly) support the hypotheses that empathy is associated with more outgroup positivity and less ingroup bias (ingroup minus outgroup attitude). The negative link between empathy and outgroup bias was stronger when peers were perceived to be more biased against the outgroup.

Although schools have been described as an important socialization context for the development of intergroup attitudes, longitudinal multilevel studies are still rare within this field. This 3-wave study (with annual assessments) of German adolescents (N = 1292; Mage = 13.86; 51.8% female) examined the role of school experiences (perceived multicultural education, supportive peer relations in class, democratic classroom climate) in the development of youth's negative attitudes toward immigrants. Longitudinal multilevel analyses revealed that a democratic classroom climate predicted youth's attitudes at the individual level. At the classroom level class-average perceptions of a democratic classroom climate, supportive peer relations in class, and multicultural education (the latter solely among male, higher track students) were associated with less negative attitudes toward immigrants. In addition, age moderated the effect of school experiences on attitudes, showing that perceptions of a democratic climate at the classroom level mattered in particular among older adolescents. The findings suggest that school experiences are related to youth's negative attitudes toward immigrants and can therefore help to reduce the risk of prejudice development.

This chapter brings together social and developmental research on ethnic majority youth reactions to growing diversity. It shows no general trend in youth attitudes towards immigrants in recent decades, suggesting that youth reactions may be determined by the proximal social environments they are embedded in. Therefore, this chapter reviews research on the role of proximal social contexts, in particular parents and peers, in shaping youth attitudes. It then proposes an integrative, ecological perspective that looks at the interrelated effects of parent, peer, and school context. It concludes by discussing the challenges and benefits of such an approach, including how it can facilitate more comprehensive models of prejudice development and guide our attempts to ensure positive relations among youth in a diverse world.

Prejudice is one of the major threats to the cohesion of multicultural societies and adolescent years play a key role in its development. How social contexts contribute to adolescent prejudice is, however, not yet well-known. This 3-wave study of Swedish majority adolescents (N = 659; M-ageT1 = 13.41; M-ageT3 = 17.33) examined the effects of parents' and peers' attitudes on changes in youth attitudes toward immigrants as well as an interplay between parent, peer, and school context. The results of multilevel analyses revealed that within-person fluctuations in youth attitudes were positively related to fluctuations in peers' but not parents' attitudes. Both parents' and peers' attitudes, however, significantly predicted the differences in level and rate of change in attitudes between adolescents. In addition to these direct effects, mediation analysis showed that parents' attitudes predicted youth attitudes indirectly, via the attitudes of the peers youth associate with, suggesting an overall greater importance of parental bias. Peers' attitudes did not moderate the effects of parents but youth from ethnically diverse classrooms were less affected by their parents' prejudice than youth from less diverse classrooms. The findings contribute to a better understanding of the role of social context in the development of prejudice. They suggest that while parents set the stage, peers explain the day-to-day variation in prejudice, and that classroom diversity offsets some of the negative effects of parental bias.

Although research has shown that school context has consequences for intergroup attitudes, few studies have examined the role of teacher qualities, such as teacher support. In addition, previous research has paid limited attention to the mechanisms that could help to explain teacher effects. This 5-wave study (2010–2015) examined the effects of perceived teacher support on the anti-immigrant attitudes of Swedish majority youth (N = 671, Mage = 13.41, 50.2% girls, 34 classrooms). It also tested whether social trust would mediate these effects. The results of multilevel analyses showed that perceived teacher support was associated with less prejudice at all levels of analysis. At the within-person level, fluctuations in teacher support were related to fluctuations in youth prejudice: in years when, on average, adolescents perceived their teachers as more supportive, they reported lower prejudice. At the between-person level, adolescents who perceived their teachers as more supportive compared to their peers reported lower prejudice. Similarly, classrooms where students shared an experience of teacher support were lower in prejudice than classrooms with weaker teacher support. The results also showed that social trust explained teacher effects: adolescents who experienced their teachers as more supportive displayed higher levels of trust and, in turn, lower levels of prejudice than youth with less supportive teachers. These findings suggest that teachers can counteract the development of prejudice and facilitate social trust in adolescents by being supportive of them.