Abstract: Reflecting coping with threats to survival, national cultures differ in baseline levels of ingroup favoritism. These national baselines are mapped and explained in terms of inhabitants’ cultural adaptations to climate-based demands and wealth-based resources. A 73-nation study of compatriotism—the social branch of patriotism—a 116-nation study of nepotism, and a 57-nation study of familism support the demands-resources explanation. Compatriotism, nepotism, and familism are strongest in lower-income countries with demanding cold or hot climates, moderate in countries with temperate climates irrespective of income per head, and weakest in higher-income countries with demanding cold or hot climates. Thus, cultural echos of climatic survival hold up across three distinct group conditions of genetic survival. Integration of the three measures provides a cross-disciplinary applicable index of baselines of cultural ingroup favoritism in 178 countries around the globe.