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National identity definitions determine who belongs to the national ingroup (e.g., “us Germans”) versus the “foreign” outgroup prone to hostile outgroup bias. We conducted five studies in two countries investigating if viewing the ingroup's national identity as fixed exacerbates the perceived divide between ingroup and outgroup and thus increases anti‐immigrant hostility, while a malleable view blurs the divide and reduces anti‐immigrant hostility. In a Prestudy (58 participants), an Implicit Theory of National Identity Scale was developed. In Studies 1 (154 participants) and 2 (390 participants), our scale predicted individuals’ prejudice and participation rates in a hypothetical referendum and a real petition against immigrants. In Studies 3 (225 participants) and 4 (225 participants), experimental evidence was obtained. Leading participants to believe that the definition of “a true compatriot” changes over time (rather than remaining the same) resulted in lower levels of prejudice and participation rates in an anti‐immigrant petition.

Abstract. The social integration of the ever-growing number of refugees in receiving societies is of major importance. Perceived discrimination has been found to predict fewer friendships with natives over time. But what short-term mechanisms explain this effect? In a sample of 115 refugees living in Germany we (i) replicated the long-term discrimination-social-integration relationship, (ii) found short-term associations between discrimination and affective, motivational, and behavioral tendencies not to befriend natives, and (iii) showed authenticity to mediate this short-term relationship: with increasing discrimination, refugees felt less like they could show their authentic selves around natives, which in turn impaired tendencies to befriend natives. Discrimination may impede the formation of interethnic friendships by instilling feelings of inauthenticity. Implications for prevention measures are discussed.