This repository contains the full replication materials for the manuscript “How Intergroup Contact and Social Norms Shape Outgroup Trust Over Time among Indigenous and Non-Indigenous People,” which is currently submitted and awaiting revision. The materials are provided to support transparency and reproducibility of the analyses reported in the paper. The Input directory includes the datasets used in the study, data handling and preparation scripts, the variable list, and the survey questionnaire. The Process directory contains the main statistical analysis scripts used to estimate the models and generate results. The Output directory includes all analytical outputs, including the tables and figures reported in the manuscript and supplementary materials. All results reported in the paper can be reproduced by running the scripts in the Process folder using the materials provided in the Input folder. Any future updates associated with manuscript revisions will be released as new versions of this repository.