When assigning homework exercises for a survey course that I teach on American foreign policy, I tell my students that no matter how strong the arguments they use to defend their positions, if they neglect to examine how demographic trends will affect their proposals, they will get an F. What is true for my students is true for global policymakers: Demographic trends will shape our future in a much more profound sense than most of the developments we see on the front page of the New York Times. Four major demographic trends in particular will shape the global security landscape […]