They are missing in America too.
You are incorrect - the difference is not statistically significant in the US. More men than women are born to start with btw. This reverses with age, as women live longer than men on average.
https://www.cia.gov/cia/publications/factbook/geos/us.html#People
Yes. 40 million of them, for a population a fourth of that of India.
If America were as populous as India, that means 160 million Americans are missing.
http://www.nrlc.org/abortion/aboramt.html
Over 40 Million Abortions
in U.S. since 1973
There have been more than 40 million abortions in the twenty six years since the U.S. Supreme Court legalized unrestricted abortion on January 22, 1973.
Except when noted, the following statistic(see link above) are based on research published by the Alan Guttmacher Institute, special research affiliate of Planned Parenthood Federation of America--the nation's largest provider and promoter of abortion. Estimates for 1997 and 1998 are based on trends from previous years.
In the past, AGI has estimated a possible 3-6% rate of underreporting.