For the whole of World War II, the U.S. Navy station Guam was only US Territory where Japan administered the occupied local people; it was controlled by the Japanese Navy for two and a half years. Organic integration was the purpose and goal of the Japanese Navy administration of the local Chamorro people, but the navy's attempts failed before U.S. reinvasion in July 1944. By emphasizing the extent of Japan's Mandate in Micronesia, this book examines the Japanese Navy's social, economic, and cultural approaches to organic integration. Using abundant primary data, the author gives a clear and verifiable picture of the whole occupation period and the Japanese ruling ideology for not only Guam but the entire region-and finds new ways to consider just why Japan went to the war. Personal testimonies and documents enable the historian to follow the developing Japanese mentality of war as it unfolded.