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The ABCD line (ABCDライン) 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). In 1940, in an effort to discourage Japanese militarism, these Western powers 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.

Name
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 holding's, the Great East Asia Co-Prosperity Sphere. This wartime narrative portrayed Japan fighting against Western Colonialists [cite] and Chinese Communists [cite] primarily, overlooking the primacy of resource rich areas of Asia in Japan's annexing of lands.

Political Background
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 Rape of Nanking, were reported on 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 exporting military supplies to Japan in June 1939.

Economic Impact
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, sending over 70% of Japanese petroleum workers to rehabilitate facilities destroyed by the retreating colonial powers.