Demographic gender imbalance in favor of males due to prenatal gender selection and misogynism in India and China will probably handicap economic and social progress in these countries relative to the United States. The US will have a long term economic advantage due to its greater utilization of its human capital and the future social disruption likely in countries with large gender imbalances.
"Early results show India has 914 girls under age 6 for every 1,000 boys. A decade ago, many were horrified when the ratio was 927 to 1,000....In Morena, a sun-baked, largely rural district in the heart of India, the numbers are especially grim. This census showed that only 825 girls for every 1,000 boys in the district made it to their sixth birthdays, down from an already troubling 829 a decade ago."
The article discusses the social reasons for this result. It is likely that there will be serious social disruption in the future due to this.
NationMaster provides data on the gender ratio of the cohort under 15 years that shows China is worse than India:
China: 1.17 male(s)/female 2011
India: 1.13 male(s)/female 2011