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Japan was defeated because that country lacked the resources to fight a prolonged war with their primary opponent - the USA. Japan's plan was to occupy a large buffer zone in East Asia and the Pacific. They would then fall back into this buffer area, using island bases for mutual support to try and wear down the counterattacking Americans. At the same time they hoped to build up large stockpiles of vital materials taken from occupied areas, since Japan had little commodity production domestically. Both plans failed. The USA adopted tactics that allowed them to isolate the various key Japanese fortress islands. Once the USA had advanced through a few of these islands the home islands of Japan came under bomber attack. The USA also ran a very successful submarine campaign against the Japanese merchant marine which prevented the Japanese from importing oil, food, timber, and other commodities. Near the end of the war Japan still had large and effective armies in SE Asia and China, since these were largely supplied from local sources. But in Japan itself the USA airforces rained supreme and the USA Navy had destroyed all the main Japanese surface fleet. Japans position was thus untenable and they surrendered.

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20y ago

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