The author of this book is Dr. Wenyi Yu. He has a multidisciplinary background. He writes for world peace. His research results show that the world must be at peace then human beings can be happy. Individual happiness, national stability, and world peace are the premise and the conclusion of the author's trilogy about the facts, analysis, and strategies of the United States, China, and Russia, respectively. The materials for these studies came from events the authors have seen, learned, or experienced since the 1970s. To keep a scientific studying approach, the author tried to maintain a neutral position in order to obtain an objective conclusion - this is fundamental to an accurate result. The comprehensive, rich, developed, and convenient information resources of the United States provide rich nutrition for his research. In the accelerating changing times, the author expects that more people will independently think about what they have witnessed and what happened around them. Dr. Yu lives in New York.