In America First: National Realism in the 21st Century, Aaron T. Walter argues that the Trump-era doctrine commonly dismissed as chaotic in fact represents a new and coherent grand strategy. He calls this approach National Realism—a framework that prioritizes sovereignty, reciprocity, and strategic economics over universal rules and open-ended commitments. As the post-Cold War order erodes, the United States is shifting toward networked sovereignty: a system of competitive alliances, strategic economics, and controlled interdependence designed to preserve American power in a multipolar world. Written in a clear and accessible style, this book appeals to students, scholars, policy professionals, and citizens interested in U.S. foreign policy, security studies, and the future of international order