Three experiments integrated several theories in psychology and sociology to identify the conditions under which multiculturalism has positive versus negative effects on majority group members' attitudes and behavioral intentions toward ethnic minorities. On the basis of social cognitive construal theories, we predicted and found that construing multiculturalism in abstract terms by highlighting its broad goals reduced White Americans' prejudice toward ethnic minorities relative to a control condition, whereas construing multiculturalism in concrete terms by highlighting specific ways in which its goals can be achieved increased White Americans' prejudice relative to the same control (Experiments 1 and 2). Using social identity threat research, we found that construing multiculturalism in abstract terms decreased the extent to which diversity was seen as threatening national identity, whereas construing it in concrete terms increased the extent to which diversity was seen as threatening national identity; threat in turn fueled prejudice (Experiments 2 and 3). Perceivers' political orientation moderated the effects of multiculturalism construals on prejudicial attitudes and social distancing behavioral intentions (Experiment 3). Symbolic threat to national identity but not realistic threat to national resources mediated these effects. Collectively, these experiments demonstrate when multiculturalism leads to positive versus negative intergroup outcomes, why, and how political orientation shapes prejudice and behavioral intentions toward ethnic minorities. (PsycINFO Database Record (c) 2014 APA, all rights reserved).