The Empire of Japan (Japanese: 大日本帝國/大日本帝国, Hepburn: Dai Nippon Teikoku/Dai Nihon Teikoku), also known as the Japanese Empire or Imperial Japan, was the period of Japanese history spanning 79 years, starting with the Meiji Restoration on 3 January 1868, and ending with ratification of the Constitution of Japan on 3 May 1947. From August 1910 to September 1945, it included mainland Japan, Okinawa, the Kurils, Karafuto, Korea, and Taiwan. The South Seas Mandate and concessions were de jure not internal parts of the empire but dependent territories. In the closing stages of World War II, with Japan defeated alongside the rest of the Axis powers, the formalized 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 mainland Japan. However, Okinawa was later returned to Japan in 1972.
Under the slogans of "Enrich the Country, Strengthen the Armed Forces" and "Promote Industry" 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. Economic and political turmoil in the 1920s, including the Great Depression, led to the rise of militarism, nationalism, statism and totalitarianism, during which Japan joined the Axis alliance with Nazi Germany and Fascist Italy, conquering a large part of the Asia–Pacific; during this period, the Imperial Japanese Army (IJA) and the Imperial Japanese Navy (IJN) committed numerous atrocities and war crimes, including the Nanjing Massacre. There has been some debate over defining the political system of the Empire of Japan as a dictatorship, due to the absence of a dictator, as well as calling it fascist. Other suggested terms are para-fascism, militarism, corporatism, totalitarianism, and police state.
The Imperial Japanese Armed Forces initially achieved large-scale military successes during the Second Sino-Japanese War and the Pacific War, most notably in the attack on Pearl Harbor in Hawaii on 7 December 1941. 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. The situation became desperate for Japan as they faced a two-front war due to the Soviet invasion of Manchuria, in addition to the United States dropping two atomic bombs on Hiroshima and Nagasaki with overwhelming destructive power. Plans had been made for an Allied invasion of mainland Japan, but were shelved after Japan accepted unconditional surrender under the Potsdam Declaration on 14 August 1945.
On 15 August 1945, the Japanese Emperor announced Japanese surrender to the Allies on the radio. However, the Pacific War only officially came to an end on 2 September 1945, leading to the end of the Empire of Japan and the beginning of the Allied occupation of Japan, during which United States military commander Douglas MacArthur administered the country. In 1947, through Allied efforts, a new Japanese 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, when the Treaty of San Francisco as a peace treaty took effect.
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 his death in 1989.
The historical state is frequently referred to as the "Empire of Japan", the "Japanese Empire", or "Imperial Japan" in English. In Japanese it is referred to as Dai Nippon Teikoku (大日本帝国), which translates to "Greater Japanese Empire" (Dai "Greater", Nippon "Japanese", Teikoku "Empire"). Teikoku is itself composed of the nouns Tei "referring to an emperor" and -koku "nation, state", literally "Imperial State" or "Imperial Realm" (compare the German Kaiserreich). The name "Empire of Japan" appeared for the first time in the 1854 Convention of Kanagawa between the United States and the Tokugawa shogunate.
This meaning is significant in terms of geography, encompassing Japan, and its surrounding areas. The nomenclature Empire of Japan had existed since the anti-Tokugawa domains, Satsuma and Chōshū, which founded their new government during the Meiji Restoration, with the intention of forming a modern state to resist Western domination. Later the Empire emerged as a great power in the world.
Due to its name in kanji characters and its flag, it was given the exonyms "Empire of the Sun" and "Empire of the Rising Sun".
After two centuries, the seclusion policy, or sakoku, under the shōguns of the Edo period came to an end when the country was forced open to trade by the Convention of Kanagawa which came when American commander Matthew C. Perry arrived in Japan in 1854. Thus, the period known as Bakumatsu began.
The following years saw increased foreign trade and interaction; commercial treaties between the Tokugawa shogunate and Western countries were signed. In large part due to the humiliating terms of these unequal treaties, the shogunate soon faced internal hostility, which materialized into a radical, xenophobic movement, the sonnō jōi (literally "Revere the Emperor, expel the barbarians").
In March 1863, the Emperor issued the "order to expel barbarians." Although the shogunate had no intention of enforcing the order, it nevertheless inspired attacks against the shogunate itself and against foreigners in Japan. The Namamugi Incident during 1862 led to the murder of an Englishman, Charles Lennox Richardson, by a party of samurai from Satsuma. The British demanded reparations but were denied. While attempting to exact payment, the Royal Navy was fired on from coastal batteries near the town of Kagoshima. They responded by bombarding the port of Kagoshima in 1863. The Tokugawa government agreed to pay an indemnity for Richardson's death. Shelling of foreign shipping in Shimonoseki and attacks against foreign property led to the bombardment of Shimonoseki by a multinational force in 1864. The Chōshū clan also launched the failed coup known as the Kinmon incident. The Satsuma-Chōshū alliance was established in 1866 to combine its efforts to overthrow the Tokugawa bakufu. In early 1867, Emperor Kōmei died of smallpox, and he was replaced by his son, Crown Prince Mutsuhito (Meiji).
On November 9, 1867, Tokugawa Yoshinobu resigned from his post and authorities to the emperor, agreeing to "be the instrument for carrying out" imperial orders, leading to the end of the Tokugawa shogunate. However, while Yoshinobu's resignation had created a nominal void at the highest level of government, his apparatus of state continued to exist. Moreover, the shogunal government, the Tokugawa family in particular, remained a prominent force in the evolving political order and retained many executive powers, a prospect hard-liners from Satsuma and Chōshū found intolerable.
On January 3, 1868, Satsuma-Chōshū forces seized the imperial palace in Kyoto, and the following day had the fifteen-year-old Emperor Meiji declare his own restoration to full power. Although the majority of the imperial consultative assembly was happy with the formal declaration of direct rule by the court and tended to support a continued collaboration with the Tokugawa, Saigō Takamori, leader of the Satsuma clan, threatened the assembly into abolishing the title shōgun and ordered the confiscation of Yoshinobu's lands.