The 1994 genocide in Rwanda left the country in tatters, its future fraught with uncertainty. Of the more than 800,000 people killed, most were men and boys. Rwanda's remaining population was 70 percent female. Fast-forward to the present day: The economy has revived and is holding steady. Major road arteries between cities and outlying villages, which were destroyed, have been rebuilt. Today, the Rwandan lower house of Parliament is nearly half female,...