Mexican districts with highest European admixture score top on PISA and Progressive Matrices. Colombian districts ranked by European admixture show SABER scores rising with more European ancestry. Brazilian regions with more European ancestry have higher PISA scores matching genetic IQ predictions. Latin American countries' average IQ correlates 0.41 with European admixture despite economic differences. Lighter-skinned US blacks score higher than darker blacks on GSS and NLSY vocabulary tests. National IQ correlates -0.90 with skin darkness across 55 countries, stronger than GDP correlation. More African ancestry lowers SES in 13 of 14 studies. More European ancestry raises SES in 11 of 13 studies. More Native American ancestry lowers success in 13 of 15 Hispanic studies. Heredetarian IQ predictions using European 100, Amerindian 90, African 84 match observed test score gradients. Bogota's high SABER scores fit its high European admixture. Skin color proxies reliably track European admixture effects on cognition. Historical Shuey studies consistently show lighter blacks outperforming darker ones. Admixture gradients produce precise test score differences exceeding expectations. Totality of admixture data supports hereditarian explanation for racial IQ gaps.