For most of its history, the United States shunned political, economic, and strategic commitments that would embroil the nation in European power politics. Then, on the eve of World War II, it dramatically changed course and resolved to make itself the world’s foremost superpower. In his new book, Tomorrow the World: The Birth of U.S. Global Supremacy, Stephen Wertheim charts America’s transformation and how and why it decided to pursue primacy in international affairs. Dr Stephen Wertheim, Deputy Director of Research and Policy at the Quincy Institute for Responsible Statecraft and Research Scholar at the Saltzman Institute for War and Peace Studies at Columbia University. Professor Steven Casey, Professor of International History at LSE. The Department of International History (@lsehistory) teaches and conducts research on the international history of Britain, Europe and the world from the early modern era up to the present day. Sponsored by the department’s The Americas in World History and Contemporary International History and the Global Cold War research clusters. Co-hosted by the Cold War Studies Project at LSE IDEAS.