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I’ve read that article before and looked into the claim. It’s an interesting take and I would love to hear what Japanese WWII scholars say.
The traditional explanation is that the term 一億 ichioku (100 million) is used symbolically to represent a very large number.
Japanese numbering gives units for 1 (一), 10 (十), 100 (百), 1,000 (千), 10,000 (万), and 100,000 is 10 x 10,000 (十万), 1,000,000 is 100 x 10,000 (百万), 10 million is (千万). 100 million is next unit, 億. The idea then it that oku is a very large number.
There is a manga The Failed Swordsman Who Became the Strongest After Spamming the 100 Million Years Button’ (一億年ボタンを連打した俺は、気付いたら最強になっていた~落第剣士の学院無双
I haven’t actually read that series, but this is an example of 100 million being used for a large number.
The author of the quoted article, Hiroaki Sato, seems to be a well-informed Japanese poet and translator and the theory is interesting. The populations work out to about 100 million in total, with 70 million in Japan, 25 million in Korea and 6 million in Taiwan, all in very rough numbers.
While the considerable measures to force Japanization of Korea is well known, there was also similar measures in Taiwan, although apparently not as harshly imposed or with a lessor scale. I haven’t read that much about it the specifics in Taiwan. However, Taiwanese are generally positive about their experience as a colony of Japan.
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As far as the willingness of the Japanese population to commit suicide en masse, there is much debate on the question of how that would have actually played out. Thankfully, it didn’t come to that.