Introduction
Chapter 1 undertakes four tasks. First, it questions whether nuclear nonproliferation, along with the containment of great power adversaries, has been a key pillar of US grand strategy since the 1940s. By doing so, it establishes the context for the book’s research questions. Second, the chapter summarizes the core argument: the interaction of international threats and domestic politics shaped the types of nonproliferation strategies (accommodative or coercive) that US presidential administrations pursued toward strategically vulnerable allies in volatile regions. Third, it situates the book within broader literature on nuclear nonproliferation and alliance management. Fourth, the chapter defines the key terms and concepts employed in the analysis and discusses the research design and case selection.