
Japan's involvement in World War II was defined by aggressive expansionism, major military engagements, and eventual defeat. Driven by regional dominance and resource acquisition ambitions, Japan launched invasions across East Asia and the Pacific. The conflict began in earnest with the invasion of China in 1937, marked by brutal campaigns such as the Nanjing Massacre.
On December 7, 1941, Japan attacked Pearl Harbor, prompting the United States to enter the war. This surprise assault aimed to cripple the U.S. Pacific Fleet, enabling Japan to secure territories rich in resources, including Southeast Asia and the Pacific Islands. Early successes included the capture of the Philippines, Singapore, and Indonesia, establishing Japan's Greater East Asia Co-Prosperity Sphere.
However, key battles such as Midway in 1942 and the protracted campaign in Guadalcanal marked turning points, with Allied forces beginning to reclaim occupied territories. Japan faced mounting defeats and resource shortages, exacerbated by relentless Allied bombing campaigns targeting industrial and civilian areas.
Despite fierce resistance, Japan's situation became untenable by 1945. The atomic bombings of Hiroshima and Nagasaki, combined with the Soviet Union's declaration of war, led to Japan's surrender on August 15, 1945. Emperor Hirohito's announcement of surrender marked the end of the conflict.
Post-war, Japan underwent significant transformation under Allied occupation, leading to the establishment of a democratic government, economic recovery, and a pacifist constitution. Japan's wartime legacy profoundly shaped its modern identity and international relations.


Report from Tokyo, a message to the American people
by
Joseph C. Grew
A Message to the American People, by Joseph C. Grew, United States Ambassador to Japan, 1932 to 1941
Ten years in Japan, a contemporary record drawn from the diaries and private and official papers of Joseph C. Grew, United States ambassador to Japan, 1932-1942.
by
Joseph C. Grew
A Contemporary Record Drawn from the Diaries and Private and Official papers of Joseph C. Grew, United States Ambassador to Japan, 1932-1942
The End of the War in the Pacific. Surrender Documents in Facsimile
by
National Archives (U.S.)
Interrogations of Japanese Officials
by
United States Strategic Bombing Survey
Japan's decision for war in 1941 : some enduring lessons
by
Jeffrey Record
Japan's decision to attack the United States in 1941 is widely regarded as irrational to the point of suicidal. How could Japan hope to survive a war with, much less defeat, an enemy possessing an invulnerable homeland and an industrial base 10 times that of Japan? The Pacific War was one that Japan was always going to lose, so how does one explain Tokyo's decision? Did the Japanese recognize the odds against them? Did they have a concept of victory, or at least of avoiding defeat? Or did the Japanese prefer a lost war to an unacceptable peace? Dr. Jeffrey Record takes a fresh look at Japan's decision for war, and concludes that it was dictated by Japanese pride and the threatened economic destruction of Japan by the United States. He believes that Japanese aggression in East Asia was the root cause of the Pacific War, but argues that the road to war in 1941 was built on American as well as Japanese miscalculations and overestimated the effectiveness of economic sanctions as a deterrent to war, whereas the Japanese underestimated the cohesion and resolve of an aroused American society and overestimated their own martial prowess as a means of defeating U.S. material superiority. He believes that the failure of deterrence was mutual, and that the descent of the United States and Japan into war contains lessons of great and continuing relevance to American foreign policy and defense decisionmakers. The Strategic Studies Institute is pleased to offer this monograph as a contribution to the national security debate over the use of force to advance the objectives of U.S. foreign policy--p. v.
The Japanese story of the battle of Midway : a translation.
by
United States. Office of Naval Intelligence, author.
On the fifth anniversary of the Battle of Midway, the Office of Naval Intelligence publishes the official Japanese action report of this engagement, recently translated under the supervision of the Naval Analysis Division, United States Strategic Bombing Survey, and here available in English for the first time.
Although this document is not perfectly complete (part IV for example is missing), it is believed that nothing of any importance will be discovered in the future to change the story in any of its essential details. The report was prepared in the first place under difficulties. It must be remembered that the war diaries of many of the ships engaged, their charts and other valuable papers were lost as a result of the ships having become "inoperational," in the Japanese euphemism.

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