National IQ causes GDP per capita and social metrics like low homicide rates and better sanitation. Intelligent countries have stronger property rights, more freedom, and fewer accidents. US newborn IQ averages 94 from white 100, Hispanic 92, black 85, Asian 105 demographics. Dysgenic fertility subtracts 1 IQ point per generation in US. Similar dysgenic patterns exist in Mexico with uneducated having twice the children of educated. High-skilled immigration raises national IQ to 101-103 boosting social development by 0.45 SD. Unskilled poor immigrants drain gene pool harming all countrymen. Hanania ignores national IQ externalities favoring low-IQ immigration. Individual IQ gains from migration don't offset population-level harms. Importing low-IQ hordes worsens accidents, crime, and infrastructure independently of economics. Racial IQ gaps persist explaining demographic drags on US IQ.