The mass movement of peoples around the globe has driven the course of human history—but what are the underlying causes of migration? This month’s featured resources will help your students answer this question and develop invaluable critical thinking skills as they evaluate the social, political, economic, and environmental drivers of migration. Key resources include an overview of Everett Lee’s push-pull theory of migration; activities designed to help students apply the theory to historical case studies of migration; and reference connecting to current events and issues, from climate refugees to unaccompanied minors.