Empire of Japan
The Empire of Japan, also known as the Japanese Empire or Imperial Japan, was the Japanese nation-state that existed from the Meiji Restoration on 3 January 1868 until the Constitution of Japan took effect on 3 May 1947. From 1910 to 1945, it included the Japanese archipelago, the Kurils, Karafuto, Korea, and Taiwan. Concessions such as the Kwantung Leased Territory were de jure not parts of the empire but dependent territories. In the closing stages of World War II, with Japan defeated alongside the rest of the Axis, the formalized Japanese Instrument of Surrender was issued on 2 September 1945 in compliance with the Potsdam Declaration of the Allies, and the empire's territory subsequently shrunk to cover only the Japanese archipelago resembling modern Japan.

Under the slogans of fukoku kyōhei and shokusan kōgyō, which followed the Boshin War and the restoration of power to the Emperor from the Shogun, Japan underwent a period of large-scale industrialization and militarization, often regarded as the fastest modernization of any country to date. All of these aspects contributed to Japan's emergence as a great power following the First Sino-Japanese War, the Boxer Rebellion, the Russo-Japanese War, and World War I. Economic and political turmoil in the 1920s, including the Great Depression, led to the rise of militarism, nationalism, statism and authoritarianism, and this ideological shift eventually culminated in Japan joining the Axis alliance with Nazi Germany and Fascist Italy, and also conquering a large part of the Asia-Pacific. During this period, the Japanese army committed many atrocities, including the Nanjing Massacre. However, there has been a debate over defining the political system of Japan as a dictatorship.

The Imperial Japanese Armed Forces initially achieved large-scale military successes during the Second Sino-Japanese War and the Pacific War. However, from 1942 onwards, and particularly after decisive Allied advances at Midway Atoll and Guadalcanal, Japan was forced to adopt a defensive stance against the United States. The American-led island-hopping campaign led to the eventual loss of many of Japan's Oceanian island possessions in the following three years. Eventually, the American military captured Iwo Jima and Okinawa Island, leaving the Japanese mainland unprotected and without a significant naval defense force. By August 1945, plans had been made for an Allied invasion of mainland Japan, but were shelved after Japan surrendered in the face of a major breakthrough by the Western Allies and the Soviet Union, with the atomic bombings of Hiroshima and Nagasaki and the Soviet invasion of Manchuria. The Pacific War officially came to an end on 2 September 1945, leading to the beginning of the Allied occupation of Japan, during which US military leader Douglas MacArthur administered the country. In 1947, through Allied efforts, a new Japan's constitution was enacted, officially ending the Japanese Empire and forming modern Japan. During this time, the Imperial Japanese Armed Forces were dissolved. It was later replaced by the current Japan Self-Defense Forces in 1954. Reconstruction under the Allied occupation continued until 1952, consolidating the modern Japanese constitutional monarchy.

In total, the Empire of Japan had three emperors: Meiji, Taishō, and Shōwa. The Imperial era came to an end partway through Shōwa's reign, and he remained emperor until 1989.
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