The ABCD line (ABCDライン Ēbīshīdī rain) was a Japanese name for a series of embargoes against Japan by foreign nations, including America, Britain, China, and the Dutch. It was also known as the ABCD encirclement (ABCD包囲陣 Ēbīshīdī hōijin). In 1940, in an effort to discourage Japanese militarism, these nations and others stopped selling iron ore, steel and oil to Japan, denying it the raw materials needed to continue its activities in China and French Indochina. In Japan, the government and nationalists viewed these embargoes as acts of aggression; imported oil made up about 80% of domestic consumption, without which Japan's economy, let alone its military, would grind to a halt. The Japanese media, influenced by military propagandists, began to refer to the embargoes as the "ABCD ("American-British-Chinese-Dutch") encirclement" or "ABCD line".
Faced with the possibility of economic collapse and forced withdrawal from its recent conquests, the Japanese Imperial General Headquarters began planning for a war with the Western powers in April 1941.
The name ABCD Line is of Japanese origin, having been disseminated by the Japanese government in propaganda and textbooks in the late 1930's. It is an example of Japanese propagandists portraying Japan as the protector of Asia, as in the name of the Japanese Empire's colonial holdings, the Greater East Asia Co-Prosperity Sphere. This wartime narrative portrayed Japan fighting against Western Colonialists and Chinese Communists primarily, overlooking the primacy of resource rich areas of Asia in Japan's annexing of lands. Japanese historian Saburō Ienaga writes that a key aspect of the Greater East Asian Co-Prosperity Sphere as propaganda was "liberating Asians from American and British imperialism".
Japan in the early 1930's pursued an expansionist foreign policy, starting with the Manchurian Incident in 1931 and continuing with further military actions throughout the decade. In 1937, this broke out into full scale war between Japan and China when the two nations' armies skirmished near the Marco Polo bridge, eventually leading to a full scale Japanese Army invasion of China. These incidents, especially the Nanking Massacre, were heavily reported in the international media. In the United States, reporting on the Japanese bombing of Chinese cities was particularly negative. This, combined with the general perception of Japanese threats to peace in Asia, contributed to 73% of general public in the United States opposing the export of military supplies to Japan in June 1939. This would result in the United States freezing Japanese assets on July 26, 1941 (alongside England and the Dutch), effectively ending the export of raw materials and petroleum to Japan.
Meetings between the military leadership of Australia, Britain, and the Netherlands in Singapore, in February 1941, only reinforced Japanese fears of an ABCD encirclement. Similar meetings took place between British leadership and Chinese forces actively fighting Japan, with the eventual goal being coordinated military aid. Japan would go on to occupy islands in the South Pacific for oil after invading the Dutch East Indies, sending over 70% of Japanese petroleum workers to rehabilitate facilities destroyed by the retreating colonial powers. Through a combination of exploiting formerly Dutch oil deposits in the East Indies and making synthetic fuel domestically, the Japanese oil production was able to peak, in the first quarter of 1943, at 80% of the oil that had been imported from the "ABCD" countries in 1940. Japan was never able to fully match pre-embargo petroleum production figures while at war.
- Kokushi Daijiten ja:国史大辞典 (昭和時代) ("Historical Dictionary"), 1980: "It was not an official term, but a term of incitement used by the Japanese media, under the guidance of the military, in order to stir up the Japanese people's sense of crisis..." (Cited by Christopher Barnard, 2003, Language, Ideology and Japanese History Textbooks, London & New York, Routledge Curzon, p.85.)
- Wray, Harold (1973). "A Study in Contrasts. Japanese School Textbooks of 1903 and 1941–5". Monumenta Nipponica. 28: 69–86 – via JSTOR.
- Ienaga, Saburo (1978). The Pacific War: 1931–1945. New York: Pantheon Asia Library. p. 132. ISBN 0394734963.
- Remembering the Rape of Nanking. p. 15.
- Daniel., Yergin, (2014-01-01). The prize : the epic quest for oil, money & power. Free Press. p. 338. ISBN 9781439110126. OCLC 893110574.
- Chihiro, Hosoya (1982). Anglo-Japanese Alienation 1919–52. Bristol: Cambridge University Press. p. 68. ISBN 0521240611.
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