Countries with taller people have bigger sex differences in height. This holds as percentage too. Every region except Oceania has 0.8-0.9% larger sex differences than Africa even after controlling average height. Regional differences vanish after controlling socioeconomic development. Central Americans and Arabs have highest sex differences after development control. Original finding disappears with development control due to confounding. Malnutrition hits male height harder than female height. No height sex difference between US Whites and Blacks favoring environment. Females select tall men boosting male height in developed areas. Industrial revolution shifted mating to quality increasing male height advantage. Same pattern may apply to intelligence trends with males gaining more.