Does young adults’ life satisfaction promote tolerance towards immigrants? The role of political satisfaction and social trust

Much prior research relies on the idea that antipathy towards immigrants is primarily driven by natives’ perceptions of the threat that immigrants represent to their economic, cultural or national well-being. Yet little is known about whether subjective well-being affects attitudes toward immigrants. This study aimed to examine whether life satisfaction would foster tolerance towards immigrants over time via the indirect influence of political satisfaction and social trust. The sample comprised young native adults (N = 1352; M age = 22.72; SD = 3.1) in Sweden. The results revealed that young adults who were satisfied with important life domains were more likely to extend their satisfaction towards the political system, which consequently resulted in a generalised expectation of trustworthiness and a widening of their circles of trusted others. This then translates into more positive attitudes toward immigrants. The findings provide evidence that it is the causal relationship between political satisfaction and social trust (rather than social trust in itself) which promotes the positive impact of life satisfaction on tolerance towards immigrants. The study highlights that fostering political satisfaction and social trust may play an important role in shaping young people’s positive attitudes towards immigrants.


Introduction
A long-established tradition in social psychological research (e.g., Branscombe & Wann, 1992;Brown, 2011) suggests that negative life experiences (e.g., financial hardship, feelings of life insecurity) can increase negative attitudes toward outgroups. In a similar vein, relative deprivation theory (Walker & Smith, 2002) postulates that, when people confront negative life circumstances, they tend to attribute them to minority-group members, particularly those who appear to be competing for resources or are seen to be the cause of their deprivation (such as immigrants; Jetten et al., 2015). Intuitively, when individuals experience high subjective well-beingand satisfaction with important life domains in particularthey should be more inclined to develop positive outgroup attitudes. However, is it true that life satisfaction is connected to tolerance towards immigrant-origin individuals? In the present study, we propose that high life satisfaction promotes tolerance towards immigrants over time via the indirect influence of political satisfaction and social trust. We utilise a longitudinal research design to test our expectations in a community sample of young native adults in Sweden.
Integrating theoretical premises of positive and cognitive psychological paradigms, we argue that high life satisfaction makes individuals more likely to misattribute their positive cognitions and affective states to normatively unrelated judgments, such as evaluative perceptions of and beliefs about outgroup members, including those of immigrant-origin (e.g., Tenenbaum et al., 2018). Moreover, we assume that high life satisfaction may translate into young people's tolerance towards immigrants via their increased political satisfaction and sequentially increased social trust. Specifically, we theorise that native majority youth who experience high levels of life satisfaction may reciprocate by demonstrating satisfaction with democracy and trust of political institutions (e.g., Esaiasson et al., 2019;Mattila & Rapeli, 2018;Wroe, 2014) which, in turn, may lead to a broader generalised expectation of trustworthiness and the widening of their circles of trusted others (e.g., Helliwell & Putnam, 2004;Valenzuela et al., 2009;Zanin, 2017), thus leading to positive attitudes towards immigrants.
We contribute to the literature in a number of ways. First, contrary to the majority of studies in the field, we focus on positive (rather than negative) attitudes towards immigrants. Given that tolerance cannot simply be predicted by the absence of prejudicial and xenophobic attitudes and should be analysed as a separate construct (e.g., Korol, 2019;Korol et al., 2018;van Zalk et al., 2013), it is important to identify the specific factors that impact on its development. Second, we demonstrate that subjective well-being, and life satisfaction in particular, has an important role to play in promoting favourable attitudes towards immigrants. Prior research has primarily sought to explain (negative) attitudes towards immigrants through the lens of the threat perceptions that they represent to an individual economic (e.g., Hainmueller & Hiscox, 2007;Schneider, 2008;Semyonov & Glikman, 2009) or cultural well-being (e.g., McLaren, 2003;McLaren & Johnson, 2007;Sides & Citrin, 2007) and thus has largely ignored the role of subjective well-being in this process. A third and related contribution is that we examine the underlying mechanisms in the relationship between life satisfaction and tolerance towards immigrants. Our findings reveal that it is the causal relationship between political satisfaction and social trust that translates positive effects of life satisfaction into tolerance towards immigrants. Fourth, we utilise a longitudinal research design to test our expectations from the longterm perspective and examine all the processes over time.
Finally, we zoom out on native majority young adults and attempt to extend our understanding of what shapes positive attitudes towards immigrants during this important developmental period.
This discussion is particularly important given that the increasing global migration to Europeand to Sweden in particularover the last half-century has diversified earlier, more homogenous, populations. Specifically, in the latest update by Statistics Sweden (2020), about 20% of the Swedish population in 2019 were foreign-born and more than a third had either on or two parents born abroad. This diversity is not perceived by everyone as positive and, although antiimmigrant sentiment in opinion polls has been largely stable over time (Bevelander & Hellström, 2019;Demker, 2014), during the last 20 years anti-immigrant voices have been louder in public debate and there has been a gradual increase in people voting for populist anti-immigrant parties. Recent research points to the end of Swedish exceptionalism, which was associated with the previous, relatively generous, Swedish path and the absence of any populist radical party in the national parliament. This is, obviously, no longer the case (Emilsson, 2018;Rydgren & van der Meiden, 2019). Moreover, although Sweden has relatively high levels of social and political trustwhat is called a high-trust society (Rothstein, 2001)these parties seem to attract Swedish voters with lower general levels of trust (Bélanger & Nadeau, 2005). Finally, Sweden is also among those countries where citizens indicate higher than average levels of life satisfaction in the EU (Eurostat, 2020). Taken together, it is vital to invest more into understanding how positive attitudes towards immigrants might be promoted, particularly among young people who will determine the societies of tomorrow.
The present paper proceeds as follows: we first outline the theoretical background to our study by presenting the arguments that link life satisfaction with tolerance towards immigrants. We then theorise about the potential mediating role of political satisfaction and social trust in this relationship, before providing information on our methodology and presenting the empirical results of the study. Finally, we conclude by discussing our findings as well as highlighting their implications and contributions.

Life Satisfaction and Outgroup Attitudes
Much prior research on the role of life satisfactionand individual well-being more broadlyin affecting outgroup attitudes has predominantly focused on prejudice and xenophobia. This body of research commonly relies on the idea that antipathy and antagonism towards immigrants are primarily driven by natives' perceptions of the threat that immigrants represent to their economic (e.g., Hainmueller & Hiscox, 2007;Schneider, 2008;Semyonov & Glikman, 2009), cultural (e.g., McLaren, 2003McLaren & Johnson, 2007;Sides & Citrin, 2007) or national (e.g., Ariely, 2012;Pryce, 2018) well-being. At the same time, limited attention has been paid to whether subjective well-being has any role to play in shaping outgroup attitudesand tolerance towards immigrants in particular. As far as we are aware, only two studies have aimed to examine the relationship between subjective wellbeing and attitudes toward immigrants, studies which provided inconsistent findings. Specifically, Sirgy and his colleagues (Sirgy et al., 2018) showed that individuals (i.e., Germans aged between 18 and 70) who experienced high levels of subjective ill-being (i.e., low levels of subjective well-being) were likely to be more Islamophobic. By contrast, Gordon (2018) found that life satisfaction was not related to proimmigrant sentiments among a nationally representative probability sample in South Africa (aged 16 and over). In addition, prior studies that included life satisfaction in their analyses as a control variable (e.g., Lancee & Sarrasin, 2015;McLaren, 2003;Quillian, 1995) and a proxy indicator for personal threat (McLaren, 2003) and social alienation (Sides & Citrin, 2007) reported a weak or insignificant association with attitudes towards immigrants. Taken together, we are still very limited in our understanding of whether life satisfaction has any role to play in shaping tolerance towards immigrants.
So why might individuals with high life satisfaction be more inclined to have positive attitudes towards immigrants? To explain how life satisfaction can lead to tolerance towards immigrants, we draw on two bodies of literaturepositive and cognitive psychology. We argue that positive emotions and feelings of happiness resulting from satisfaction with important life domains and life as a whole make individuals more prone to adopt favourable attitudes toward immigrants. Specifically, recent research in positive psychology provides some evidence that greater life satisfaction generates positive cognition and affective states. For instance, Vittersø and Søholt (2011) showed that life satisfaction predicted feelings of pleasantness (a composite index of contentment, enjoyment and happiness) among young adults (aged between 18 and 31) in Norway. Relatedly, Unanue and his colleagues (Unanue et al., 2019) found that people who were more satisfied with their lives were more likely to appreciate the positive in life and, in particular, to feel a strong sense of gratitude.
At the same time, the cognitive psychology literature suggests that individuals' affective states and emotions have strong effects on cognition and may influence normatively unrelated judgments (see, for example, Forgas & George, 2001;Isen & Baron, 1991). Moreover, as postulated by the affect-as-information model (Schwarz & Clore, 1988), people tend to misattribute their emotional feelings to judgements when the cause of these judgmentssuch as the evaluative judgement of outgroupsis complex or affective in nature (Schwarz, 1990).
In line with these arguments, a recent experimental study by Tenenbaum and her colleagues (Tenenbaum et al., 2018) showed that youth (16-to 21-year-olds) who were induced to feel happiness demonstrated more tolerant attitudes toward asylum-seeking young people than did those induced to feel fear or no emotions. In a similar vein, in research based on European Social Survey data, Panno (2018) showed that individuals who reported higher levels of happiness also demonstrated more positive attitudes toward immigrants, compared to those with lower levels of happiness.
Integrating these theoretical perspectives and empirical findings, we argue that, by generating positive feelings and emotional states, life satisfaction may influence how native young adults perceive immigrants and may lead to more favourable attitudes toward this groupa group frequently viewed as a threat to natives' cultural and national hegemony (Sides & Citrin, 2007). Moreover, we assume that political satisfaction and social trust will have important roles to play in mediating the relationship between life satisfaction and tolerance towards immigrants.

The Role of Political Satisfaction
Prior research has provided support for the role of political satisfaction in the link between life satisfaction and attitudes towards immigrants. For instance, Hooghe (2012) demonstrated that Belgian citizens (aged 18 and over) who reported high levels of satisfaction with the different life domains (e.g., health, leisure time, professional life) were more likely to be satisfied with the way in which democracy worked in Belgium and with the type of society in which they lived. Similarly, Esaiasson and his colleagues (Esaiasson et al., 2019) showed that life satisfaction was strongly related to democratic satisfaction across European countries, over and above the confounding factors at country and individual levels. Furthermore, the researchers also found that people who had experienced a critical life event (i.e., the termination of a close personal relationship) reported lower levels of support for the government and that this support-undermining effect was mediated by decreases in life satisfaction.
One possible way to explain the link between life satisfaction and political satisfaction is to view the latter as a contractual relationship between the individual and the political system. According to psychological contract theory, contractual relationships function as an analytical tool that links citizens and their schemas (i.e., attitudes, beliefs) to the larger social structures in which they are situated (for further discussion, see Rubin, 2012). This theoretical perspective assumes that individuals extend their support to a political system only when they feel that they are receiving a certain level of benefits from it (e.g., security, a reasonable level of material wellbeing) and decent life conditions that meet their expectations (see, for example, the happiness contract model -Esaiasson et al., 2019and the psychological-democratic trust contract, Mattila & Rapeli, 2018;Wroe, 2014). Thus, when native young adults experience high levels of satisfaction with important life domains, they may reciprocate by displaying trust for political institutions as well as satisfaction with democracy in the country and its political actors.
Prior research also provides some evidence that the extent to which individuals are satisfied or dissatisfied with the political system in their country and with the functioning of democracy in general is linked to their attitudes towards immigrants. For instance, a large-scale youth survey in 14 European countries (Mieriņa & Koroļeva, 2015) showed that xenophobic, welfare chauvinistic and exclusionary attitudes toward immigrants were more widespread among youth (aged 16-25) who had low political trust as well as little interest in and understanding of politics. Relatedly, a recent study by Aschauer (2016), based on a large-scale dataset from the European Social Survey, found that individuals who reported higher levels of political disenchantment (e.g., distrust in politicians and political parties and dissatisfaction with the national government and the way in which democracy works in the country) were more likely to perceive immigrants as a threat, especially in Western Europe. Altogether, these findings suggest that political satisfaction might function as an important underlying mechanism in the relationship between life satisfaction and positive attitudes towards immigrants. Yet, to the best of our knowledge, no study has attempted to examine the mediating role of political dissatisfaction in the link between life satisfaction and tolerance towards immigrants.

The Role of Social Trust
Social trust may also mediate the relationship between life satisfaction and attitudes towards immigrants. As postulated by the broaden-and-build theory (Fredrickson, 2001), experiencing life satisfaction triggers positive emotions, which broaden an individual's world view and view of him/ herself and, thus, lead to better social relations and skills. In other words, when people are satisfied with important life domains and their life as a whole, they tend to shift their attention away from themselves and towards others and actively engage in prosocial behaviour (Aknin et al., 2018;Lyubomirsky et al., 2005;Oishi et al., 2007) that stimulates the building of trusting relationships with others (Brehm & Rahn, 1997;Putnam, 2000). Supporting these arguments, existing empirical research (e.g., Helliwell & Putnam, 2004;Valenzuela et al., 2009;Zanin, 2017) has found life satisfaction to be positively associated with general interpersonal trust. For instance, using cross-sectional data from a national survey in Italy, Zanin (2017) found that people who reported high levels of life satisfaction were more likely to report higher social trust. Relatedly, by conducting five experimental studies, Dunn and Schweitzer (2005) showed that people who experienced happiness were more likely to display interpersonal trust.
Prior research has also provided compelling evidence that social trust leads to positive attitudes towards immigrants. In particular, a study by Herreros and Criado (2009), employing data from the European Social Survey across 16 countries, found that individuals with higher levels of social trust had more positive attitudes towards immigrants, above and beyond other relevant determinants of a native individual's opinions on immigration (e.g., levels of unemployment, percentage of foreign population). Recent research also based on a large-scale dataset from the European Social Survey covering 21 countries (van Linden et al., 2017) showed that people who reported high generalised trust were less prone to exhibit antiimmigrant sentiments. These findings suggest that social trusters extend their positive worldviews towards different members of society and widen their circles of trusted others to also include immigrant-origin individuals. Hence, it is possible that social trust may pave the potential way through which life satisfaction may promote tolerance towards immigrants.
Although social trust has been considered as an antecedent to rather than the outcome of supporting orientations towards the political system (Newton et al., 2018;Putnam, 2000;Zmerli & Newton, 2008), the opposite causal direction of this relationship has also been established in the literature (Brehm & Rahn, 1997;Kumlin & Rothstein, 2005). As argued by Sønderskov and Dinesen (2016), the fairness and effectiveness of political and governmental institutions provide important clues about the norms of others and form the basis for generalised expectations of the trustworthiness of others. Prior empirical research has echoed this theoretical perspective and found strong associations between attitudes supporting both democracy and the political system and social trust (e.g., Newton & Zmerli, 2011;Rothstein & Stolle, 2008;Sønderskov & Dinesen, 2014;You, 2012). More recently, utilising two Danish panel surveys, Sønderskov and Dinesen (2016) provided strong evidence that institutional trust can exercise a causal impact on social trust, whereas the evidence for a reverse causal link was limited. Additionally, a study based on a national survey in China (Tao et al., 2014) showed that people who reported higher levels of political trust were more inclined to exhibit greater social trust.
Taken together, it might be expected that political satisfaction and social trust would mediate the relationship between life satisfaction and tolerance towards immigrants in a causally connected manner. Specifically, it is plausible that native individuals who are satisfied with their important life domains and life as a whole will be more likely to exhibit higher levels of political satisfaction and, consequently, social trust which, in turn, will make them more inclined to hold positive attitudes towards immigrants. Nonetheless, no research to date has focused on understanding whether political satisfaction and social trust have any role to play in the link between life satisfaction and tolerance towards immigrants.

The Present Study
The present study is designed to understand how life satisfaction might promote tolerance towards immigrants among native majority young adults over time. Finding meaning in life and experiencing satisfaction with important life domains have been established as essential developmental tasks in young adulthood (Arnett, 2015;Mayseless & Karen, 2014). Moreover, given the evidence suggesting that outgroup attitudes continue to crystallise further through adulthood (Henry & Sears, 2009), we decided to focus on native young adults and have attempted to extend our understanding of the role of life satisfaction in shaping positive attitudes towards immigrants during this important developmental period. Specifically, we examined whether political satisfaction and social trust would mediate the over-time relationship between life satisfaction and tolerance towards immigrants in a causally connected manner. We hypothesised that life satisfaction positively affects young people's tolerance towards immigrants via their increased political satisfaction and sequentially increased social trust. In order to test these relationships, we used a longitudinal design and followed three age cohorts of native majority young adults (aged 20, 22 and 26 years) over a period of two years.

Participants
The data for the present study were taken from a large longitudinal surveythe Political Socialization Program (Amnå et al., 2009), conducted in a medium-sized Swedish city of about 137,000 inhabitants. The city is similar to the national average in its population density, levels of unemployment and income and its share of the immigrant population (Statistiska Centralbyrån, 2019). Our sample consisted of three age cohorts of young adults (20, 22 and 26 years old) who were followed biannually over a period of four years.
The target sample comprised approximately 1000 individuals in each age group, who were randomly selected from a list, provided by the county, of all 20-26-year-olds living in the city. The questionnaire was mailed to the target sample, together with a personalised link to the online version of the questionnaire. The participants received information about the voluntary nature of their participation and the assurance of the confidentiality of the answers provided. The respondents received a gift card of 28€ for their participation in the study. All the procedures were approved by the [removed for masked review].
For the purposes of the present study, we focused only on young adults of native origin and excluded those with an immigrant background (i.e., with at least one parent born outside Sweden). After processing the data, the final analytic sample was made up of 1378 individuals: 479 aged 20, 420 aged 22 and 479 aged 26 (see Fig. 1). Taken as a whole, 57.3% were young females. Regarding education level, 20.7% of the respondents finished vocational high school, 40.7% finished academic high school and 27.8% finished college or university. A majority of young adults reported that they had moved away from home and had no children (80.6 and 91.4% respectively). In response to a question about their civil status, 36.9% said that they were married/co-habiting, 19.7% mentioned that they had a partner/partner in a separate residence and 43.1% reported that they were single.

Measures
Life Satisfaction Youth were asked to report on how satisfied or dissatisfied they were with the following: their relationship with their parents and friends and their private finances, home, education and life as a whole. The response scale ranged from 1 (Totally dissatisfied) to 7 (Totally satisfied). Higher scores indicated greater life satisfaction (Cronbach's α T1 = 0.78).
Political Satisfaction In order to assess young adults' political satisfaction, we focused on the following two dimensions: 1) political trust in the parliament and the government; 2) satisfaction with democracy and political actors. The first dimension was measured via two items concerning the degree of their institutional trust in the parliament and the government, taken from a seven-item scale on political institutions. Responses were given on a 4-point Likert-type scale, ranging from 1 (No trust at all) to 4 (A lot of trust). The second dimension was assessed via the following two questions: 'On the whole, how satisfied are you with the way democracy works in Sweden?' and 'How satisfied are you with the way in which the sitting government is handling its tasks?' The response scale ranged from 1 (Not at all satisfied) to 4 (Very satisfied). Higher scores indicated a greater degree of political satisfaction (Cronbach's α T1 = 0.84). In addition, confirmatory factor analysis demonstrated that these four items loaded on one factor with the factor loadings ranging between 0.77 and 0.91.
Social Trust Young adults were asked to report on their social trust by assessing the two items: 'Most people can be trusted' and 'Most people are fair and don't try to exploit you'. The response scale ranged from 1 (Doesn't apply at all) to 5 (Applies perfectly). The correlation between the two items was 0.75. Higher scores indicated greater social trust (Cronbach's α T1 = 0.78).
Tolerance Tolerance towards immigrants was assessed via three items adapted from prior research on inter-group attitudes (van Zalk et al., 2013;van Zalk & Kerr, 2014). The respondents were presented with the stem question 'What are your views on people who have moved here from other countries?' and were asked to rate items on a four-point Likert-type scale, ranging from 1 (Does not apply at all) to 4 (Applies very well). The items included: 'Our culture gets enriched when people from other countries move here', 'That people move to Sweden is good for the Swedish economy' and 'In the future, Sweden will be a country where there are exciting encounters between people from different parts of the world'. Higher scores indicated greater tolerance towards immigrants (Cronbach's α T1 = 0.80, α T2 = 0.81).

Control Variables
In the present study, we controlled for gender (1 = female), educational level and socio-economic status (SES).
Educational level. Youth's educational level was measured by a question about their achieved education, ranging from 1 (Did not finish compulsory school) to 7 (University college/university, three years or more).
Perceived socio-economic status. To assess how young adults perceived their socio-economic status, we asked them if they ever had difficulty in handling their ongoing expenses (for food, rent, other household items, etc.; 1 = 'Yes', 2 = 'No').

Attrition Analysis
We conducted a logistic regression analysis to examine whether attrition from Time 1 (T1) to Time 2 (T2) was due to any systematic bias. We regressed attrition (dropout = 0, retention = 1) on the young adults' demographic characteristics and all the key variables. The results revealed no significant differences between young adults who participated at T1 and T2 and those who responded only at T1. Therefore, we concluded that attrition had no effect on the results. Finally, we used the expectationmaximisation (EM) method to estimate missing values and the result of Little's missing completely at random (MCAR) test was not statistically significant, χ (38) = 43.25, p = 0.257.

Data Analysis
All analyses were conducted in SPSS Statistics Version 25. First, we examined the descriptive information and the correlations between all the study variables. Next, we used serial mediation analysis to examine the multiple mediating pathways between life satisfaction and tolerance via political satisfaction and social trust among native young adults. Serial mediation analysis allows the testing of multiple mediators simultaneously (i.e., the total indirect effect) while controlling for both collinearity and mediational effects. For this purpose, we applied the SPSS macro PROCESS (Model 6; Hayes, 2013) with two mediators (i.e., political satisfaction and social trust). The bootstrapping method was used to test for the significance of the effects in order to obtain robust standard errors for parameter estimation. Bootstrapping is considered the most powerful and effective method for estimating the significance of indirect effects, makes no assumptions about normality in the sampling distribution and has superior control over Type 1 errors (Preacher & Hayes, 2004). In our study, we utilised 5000 bootstrap estimates for the construction of 95% bias-corrected confidence intervals (CIs) for the effect estimates. We used CIs rather than the point estimate (or probability value) in evaluating the significance of the mediating effects. The effects were statistically significant if the 95% bias-corrected CIs did not include zero. In the serial mediation analysis, we controlled for participants' gender, educational level, perceived SES and tolerance at T1.

Preliminary Analyses
Means, standard deviations and correlations between the study variables are presented in

Serial Mediation Analysis
The serial mediation analysis examined whether the relationship between life satisfaction and tolerance towards immigrants would be mediated via political satisfaction and social trust. The serial mediation model (see Fig. 2  was also found to be significant. The total amount of variance accounted for by the overall serial mediation model was 53.50%. Thus, the serial mediation analysis revealed that the relationship between life satisfaction and tolerance towards immigrants was fully mediated via political satisfaction and social trust. Taken together, the results showed that native majority youth's life satisfaction positively predicted tolerance towards immigrants through the sequential increase of their political satisfaction and social trust. We also ran an alternative serial mediation analysis to examine the relationship from life satisfaction to social trust to political satisfaction to tolerance towards immigrants. Yet, the serial mediation effect via social trust and political satisfaction (B = 0.0005, SE = 0.0008, p > 0.05, 95% CI [-0.0011, 0.0021]) was found to be non-significant. Overall, we conclude that there is robust statistical evidence for the positive effect of life satisfaction on tolerance towards immigrants through the sequential relationship between political satisfaction and social trust.

Discussion
European societies, including Sweden, are becoming more ethnically and culturally diverse as a result of an influx of immigrants, refugees and asylum-seekers across its national borders. Despite the positive effects of immigration on European statessuch as increasing the number of people of working age willing to take on low-paid jobs and providing extra taxes for an economy (Eurofound and International Labour Organization, 2019)xenophobia and antiimmigrant sentiments are on the rise among the EU native population (Bevelander & Wodak, 2019). This trend of growing intolerance is particularly evident among young people, who face increasing insecurity on the labour market (Mieriņa & Koroļeva, 2015) and greater competition from immigrants in areas such as the employment and housing markets (Janmaat & Keating, 2019). Such a hostile and unwelcoming environment threatens the harmonious integration of newcomers into a host society and might have detrimental consequences for the social cohesion and future prospects of the immigrant-receiving countries. Although research has gone a long way towards understanding the determinants of antiimmigrant attitudes, little is known about what might promote positive attitudes towards immigrants in young adulthood. To fill this gap in the existing knowledge, the present study was designed to clarify the role of life satisfaction in shaping tolerance towards immigrants among native young adults. Specifically, we examined the over-time effect of life satisfaction on tolerance towards immigrants while considering the mediating roles of political satisfaction and social trust simultaneously.
Consistent with our initial expectations and prior research in the field (e.g., Gordon, 2018;Sirgy et al., 2018), the present study showed that life satisfaction has important implications for the adoption of positive attitudes towards immigrants. In particular, we found that the specific indirect effect of life satisfaction on tolerance towards immigrants via both political satisfaction and social trust was significantly positive. Supporting our hypothesis, the study showed that the positive impact of life satisfaction on tolerance towards immigrants occurs through a process in which political satisfaction increases social trust which, in turn, leads to more positive perceptions of immigrants. In other words, this finding indicates that native young adults who are satisfied with important life domainsand life as a wholeare more likely to extend their satisfaction to the political system, which consequently results in a generalised expectation of trustworthiness and the widening of their circles of trusted others, translating into more positive attitudes towards immigrants. These findings are in line with prior research that highlights the importance of subjective well-being in facilitating supporting attitudes towards  the broader society (e.g., Esaiasson et al., 2019;Hooghe, 2012) and building trusting relationships with others (e.g., Helliwell & Putnam, 2004;Valenzuela et al., 2009;Zanin, 2017) as well as the implications of political satisfaction and social trust for attitudes towards immigrants (e.g., Aschauer, 2016;Herreros & Criado, 2009;van Linden et al., 2017). It warrants mention that the specific indirect effect of life satisfaction on tolerance towards immigrants via political satisfaction was found to be non-significant. This finding reveals that, although life satisfaction exerts a positive impact on political satisfaction, this positive influence does not translate into tolerance towards immigrants unless it is followed by social trust. Hence, political satisfaction does not directly lead to more positive attitudes towards immigrants but, rather, has an indirect influence via an increase in social trust. The results support previous findings about the significant role of both political and social trust as major determinants of people's attitudes towards immigrants (e.g., Halapuu et al., 2014), and also add to prior research showing the causal link between institutional and interpersonal trust (e.g., Sønderskov & Dinesen, 2014, 2016. At the same time, the significance of another specific indirect influence of life satisfaction on tolerance towards immigrants only via social trust demonstrates that high life satisfaction promotes positive attitudes towards immigrants by triggering trusting relationships with others. This finding underscores the important role of interpersonal social trust propelled by high life satisfaction in shaping tolerance towards immigrants. The results obtained might imply that the over-time role of life satisfaction in promoting positive attitudes toward immigrants is better explained by an increase in social trust among young adults rather than by an increase in their political satisfaction. Nonetheless, the significance of the serial multiple mediating effect (i.e., via both political satisfaction and social trust) indicates that this relationship is more complex than independent additive effects. Specifically, this finding demonstrates that the mediating role that social trust plays in the relationship between life satisfaction and tolerance towards immigrants might be particularly due to its causal link with political satisfaction. To put it another way, the findings provide meaningful evidence that it is the causal relationship between political satisfaction and social trust (rather than social trust by itself) that promotes the positive impact of life satisfaction on shaping tolerance towards immigrants.

Strengths, Limitations and Future Directions
The research presented here has a number of major strengths. It is the first study to examine the role of native majority youth's life satisfaction in promoting tolerance towards immigrants in the longitudinal perspective. Thus far, the relationship between subjective well-being and attitudes towards immigrants received support from cross-sectional research. This study is also the first to provide an insight into the potential underlying mechanisms that might link high life satisfaction with positive attitudes towards immigrants over time. Specifically, our findings provide evidence that high levels of life satisfaction lead to tolerance towards immigrants via their increased political satisfaction and sequentially increased social trust (rather than only social trust by itself). Moreover, the important contribution of this study is that, unlike much prior research in the field, it examines positive attitudes towards immigrants as a separate construct (independently from negative attitudes towards immigrants). Finally, the current study focuses on the role of life satisfaction in shaping tolerance towards immigrants in young adulthood where the research is still scarce. Thus, its findings contribute to our understanding of what might promote positive attitudes towards immigrant-origin individuals during this important stage of human development when outgroup attitudes still continue to crystalise (Henry & Sears, 2009).
Our findings should be viewed in the light of the present study's potential limitations. First, while analysing tolerance towards immigrants we captured only the attitudinal dimension. At the same time, we acknowledge that the conceptualisation of tolerance could be broader and also include a behavioural dimension. Future studies may need to apply more varied measurement strategies in order to understand the impact of life satisfaction on different dimensions of tolerance towards immigrants. Second, the use of self-reporting questionnaires may have caused the data to be susceptible to social desirability and response biases. Future research could eliminate this possibility by supplementing the self-reported measures with other informant reports (e.g., from family members or friends) or by including a social desirability bias scale as a control variable.
Third, the present study is based on the data collected from a single city in Sweden. The sample is fairly similar in demographic characteristics to the national average (e.g. in terms of income, level of education, etc.). Nonetheless, we cannot say that the findings are valid for young adults in other countries. The existing literature suggests that young people's experiences of life satisfaction are embedded in specific sociocultural contexts (Diener & Oishi, 2004;Tov & Diener, 2009) and vary between nations with different levels of development (Diener et al., 2010). Therefore, the findings reported here need to be cross-validated in other national and cultural contexts. Fourth, this study has focused on the role of life satisfaction in shaping tolerance towards immigrants via political satisfaction and social trust among native young adults. Future research may contribute to the literature by examining whether the results obtained could also apply to representatives of ethnic-minority groups. Finally, the current study has attempted to explore the mediating mechanisms in the link between life satisfaction and tolerance towards immigrants, although future studies should also examine the moderating conditions (for example, friendships with immigrant-origin individuals) of this complex relationship.

Conclusions and Implications
Much prior research relies on the idea that antipathy towards immigrants is primarily driven by natives' perceptions of the threat that immigrants represent to their economic, cultural or national well-being. Yet, little is known about whether subjective well-being affects attitudes towards immigrants. To move the current research frontier forward, the present study aimed to examine the potential role that life satisfaction might have to play in promoting tolerance towards immigrants among native majority youth in Sweden. Our research findings suggest that native young adults with high life satisfaction are more prone to exhibit satisfaction with the democracy and political actors in the country which, in turn, makes them more likely to widen their circles of trusted others and triggers more positive attitudes towards immigrants. The evidence provided by the present study indicates that monitoring and increasing young people's subjective well-beingand their life satisfaction in particularis important for improving their views and perceptions of immigrant-origin individuals. A large body of prior research in positive psychology has recommended a variety of ways to enhance youth's life satisfaction through cultivating positive cognition, feelings and behaviours (for reviews, see, for example, Allen, 2018;Sin & Lyubomirsky, 2009). These strategies may serve as a basis for developing new programmes that aim to promote tolerance through enhancing life satisfaction among young adults. Moreover, as suggested by our findings, these programmes may become more successful through integrating components designed to enhance political satisfaction and social trust as important mechanisms in shaping young people's positive attitudes towards immigrants. Overall, the study opens up new possibilities of promoting youth's tolerance towards immigrants as well as appreciation of ethnic and cultural diversity among native majority individuals.
Acknowledgements This publication resulted (in part) from research supported by the grant from the Beatriu de Pinós Programme, funded by the Direcció General de Recerca de la Generalitat de Catalunya (General Directorate for Research in the Government of Catalonia) and co-funded by the European Union through the COFUND programme (contract number 801370) for Marie-Skłodowska-Curie actions in the "Horizon 2020" programme.
This study was made possible by access to data from the Political Socialization Program, a longitudinal research programme at YeS (Youth & Society) at Örebro University, Sweden. Responsible for the planning, implementation, and financing of the collection of data were professors Erik Amnå, Mats Ekström, Margaret Kerr, and Håkan Stattin. The data collection was supported by grants from Riksbankens Jubileumsfond. The authors received permission to use the data for the current study from Håkan Stattin.
Funding Open access funding provided by Malmö University.
Data Availability The data generated and/or analyzed during the current study are not publicly available.

Declarations
Ethical Approval The Regional Research Ethics Committee in Uppsala approved the study procedures.
Informed Consent All participants were informed about the study procedure and consented to take part in the study.

Declaration of Conflicting Interests
The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
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