Many constructivists analyse international relations by looking at goals, threats, fears, cultures, identities, and other elements of "social reality" as social facts. In an important edited volume, "The Culture of National Security", constructivist scholars—including Elizabeth Kier, Jeffrey Legro, and Peter Katzenstein – challenged many realist assumptions about the dynamics of international politics, particularly in the context of military affairs. Thomas J. Biersteker and Cynthia Weber applied constructivist approaches to understand the evolution of state sovereignty as a central theme in international relations, and works by Rodney Bruce Hall and Daniel Philpott (among others) developed constructivist theories of major transformations in the dynamics of international politics. In international political economy, the application of constructivism has been less frequent. Notable examples of constructivist work in this area include Kathleen R. McNamara's study of European Monetary Union and Mark Blyth's analysis of the rise of Reaganomics in the United States.