Historical overview
Japan’s history includes early state formation, imperial institutions, the rise of warrior governments, centralisation under the Tokugawa shogunate, rapid modernisation during the Meiji period, expansionist militarism, defeat in the Second World War and the development of a post-war constitutional democracy.
The Meiji Restoration of 1868 ended the Tokugawa shogunate and restored political authority to the emperor’s government. The new state rapidly reorganised administration, education, industry and military institutions. The Constitution of the Empire of Japan was promulgated in 1889, and the Imperial Diet first met in 1890. Japan became a major imperial power, expanding its influence in East Asia and colonising Taiwan and Korea.
Japan’s imperial expansion and military actions caused extensive suffering across Asia. The annexation of Korea in 1910, the invasion of Manchuria in 1931, the full-scale war against China from 1937 and the Pacific War from 1941 are central to the historical record. Any global human-rights archive should include the experiences of colonised peoples, prisoners of war, forced labourers and civilians affected by wartime violence.
Japan announced its acceptance of the Potsdam Declaration in August 1945. The Instrument of Surrender was signed on 2 September 1945. During the Allied occupation, Japan adopted a new constitution, promulgated on 3 November 1946 and effective from 3 May 1947. It established popular sovereignty, fundamental rights and a parliamentary system, while Article 9 renounced war as a sovereign right.
Post-war Japan developed a stable parliamentary democracy and experienced rapid economic growth. Political competition, social movements, constitutional debates and public accountability have continued to shape its democratic institutions. 国立国会図書館
Key historical timeline
- 794Heian-kyo (Kyoto) becomes the imperial capital.
- 1185Kamakura warrior government emerges after the Genpei War.
- 1603Tokugawa shogunate established.
- 1853–54Commodore Perry’s expedition leads to the opening of Japan to US relations and treaty negotiations.
- 1868Meiji Restoration begins.
- 1871Abolition of feudal domains and establishment of prefectures.
- 1889Constitution of the Empire of Japan promulgated.
- 1890First Imperial Diet convenes.
- 1910Japan annexes Korea.
- 1931Japanese forces occupy Manchuria.
- 1937Full-scale war with China begins.
- 1941Japan attacks Pearl Harbor and enters the Pacific War.
- 1945Japan accepts the Potsdam Declaration; surrender instrument signed on 2 September.
- 1946Post-war Constitution promulgated on 3 November.
- 1947Constitution takes effect on 3 May.
- 1951Treaty of San Francisco signed.
- 1955Conservative parties merge to form the Liberal Democratic Party; a long period of LDP dominance begins.
- 1993LDP loses its parliamentary majority and a non-LDP coalition government takes office.
- 2011Great East Japan Earthquake, tsunami and Fukushima Daiichi nuclear disaster.
- 2019Reiwa era begins.Important historical documents to digitiseCharter Oath of 1868.Constitution of the Empire of Japan (1889).Imperial Rescript on Education (1890), with historical context.Treaty and diplomatic records concerning Korea and Taiwan.Documents relating to the Second Sino-Japanese War and the Pacific War.Potsdam Declaration and Instrument of Surrender.Constitution of Japan (1946/1947).Treaty of San Francisco (1951).Diet proceedings, election records and constitutional amendment debates.
Archive notes
Archive and research links
National Archives of Japan – principal public records holdings – original constitutional documents and Meiji-era government records.
National Archives – Constitution of Japan and Meiji Constitution – archival descriptions of the two constitutions.
National Diet Library – constitutional chronology – dates and documents from the post-war constitutional process.
JACAR – Japan Center for Asian Historical Records – digitised historical documents concerning Japan and Asia.
Columbia University – Japan historical timeline – academic overview of major historical periods.
Editorial note: Japan’s modern history should include both the development of democratic institutions and the history of imperialism, colonial rule and wartime responsibility. Avoid presenting the post-war constitution as the beginning of Japanese history or as a complete resolution of historical disputes.