Replication package for "The Economic Returns to Citizenship: Evidence from a Meta-Analysis"

Data and code to reproduce the results in Hainmueller and Laitin, "The Economic Returns to Citizenship: Evidence from a Meta-Analysis" (PNAS, 2026). Contains the harmonized meta-analytic dataset (60 estimand-harmonized earnings estimates from 31 studies), the full analysis pipeline (R), a variable-level codebook, and derived aggregate outputs from the NaturalizeNY within-study component. Person-level credit-bureau data are restricted under a data-use agreement; MIPEX scores are not redistributed and are available at mipex.eu. See README.md.