Where Have All the Girls Gone?
Mara Hvistendahl tried to focus specifically on how the cultures discriminated against women throughout time, but sex selection doesn't account for the multiple societies it has spread across. Almost all of them prefer male children at a staggering rate. Specifically, she blames the availability of planned parenthood, and knowing the gender of the child beforehand, for the unequal ratio of boys to girls. The root of the problem, however, is deeply cultural. The availability of the science to enable that is just a reflection.