Replication Data for: New Tree, Growing Forrest: Updating Meta-Analytic Evidence on Solidarity Between U.S. People of Color Through an Extension and Partial Replication

Published meta-analytic evidence shows that across five experiments, shared
discrimination triggers solidarity between U.S. people of color (PoC), which then
strongly correlates with support for pro-outgroup policies. Mini meta-analyses like these
remain informative only if all conceptually similar experiments—regardless of statistical
significance—are evaluated. We amend this meta-analytic record by adding a new
study that only partially replicated the established solidarity pattern. Specifically, our
study evaluated whether PoC solidarity encompasses Palestinian people: a racially
stigmatized outgroup outside U.S. borders. We tested this through a pre-registered
experiment with Black adults (N=851), the prototypical person of color. Unexpectedly,
we find that exposure to shared discrimination with Palestinians insignificantly affected
Black solidarity with PoC. This pattern arises despite exploratory analyses showing that
PoC solidarity incorporates Palestinian people. Nevertheless, we still find that Black
camaraderie with PoC strongly correlates with pro-Palestinian attitudes, which reaffirms
prior work. Finally, with this partial replication included, we meta-analyze all six available
solidarity mechanisms through a random effects model. This analysis reveals that PoC
solidarity remains a viable mechanism behind inter-minority solidarity. Our results have
implications for PoC solidarity and the regular updating of meta-analytic evidence in
political science.