Beyond Observational Relationships: Evidence from a Ten-Country Experiment that Policy Disputes Cause Affective Polarization

While scholars document associations between competing parties’ policy disputes and citizens’ cross-party hostility, that is, affective polarization, we lack causal comparative evidence of how different types of ideological disagreements shape partisan affective evaluations. We investigate this issue with a priming experiment across ten Western publics, which prompts some respondents to answer questions inviting them to discuss debates over either cultural or economic issues versus a control group that receives a non-political prompt. Respondents in the economic and cultural priming conditions expressed greater distrust of out-partisans, and, among respondents who received cultural priming, those who discussed immigration in their open-ended responses expressed far more distrust towards opponents – an effect driven by right-wing respondents who discussed immigration. These findings provide comparative evidence that economic and cultural debates cause affective polarization, with immigration as a primary cultural driver.