This book examines the unfolding new relationship between Vietnam and the United States (US) since the end of the Cold War, discussing how the relationship has emerged as one of the most intriguing facets of the regional geopolitical landscape and how the two countries turned from staunch adversaries to partners within the span of four decades after the end of the Vietnam War. It explains in particular the interplay between international relations factors, such as the US' rivalry with China, and domestic factors in both countries, which, the book argues, are crucial to understanding the changing relationship. Overall, the book provides many insights into Vietnamese foreign policy and a rich context for those seeking to understand the prospects of closer Vietnam-US ties or actually trying to broaden the vistas of bilateral cooperation between Hanoi and Washington.