For the first time in history, American women are more likely to have bachelor's degrees than American men.
The shift happened in 2014, but was a generation in the making. Women have earned the majority of bachelor's degrees granted every year since 1981. As older, less-educated women have died, more educated women have made up a greater share of the population.
The story of how women started earning more college degrees than men is explored by three economists — Claudia Goldin, Lawrence F. Katz, and Ilyana Kuziemko — in a 2009 paper on women's success in higher education (http://www.nber.org/papers/w12139.pdf).