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| 1930 |
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| The population of Japan, estimated at 26.5 million in 1726 and 34.8 million in 1872, doubled in the following 63 years (69.2 million in 1935), the rate of increase accelerating steadily to a peak of 15.3 per thousand in 1930 before beginning to decline (14.4 in 1935). This rate of increase (roughly 1 million per year by 1930) created a problem because of the already high density of the Japanese population in the Tokugawa period. Public concern over the population question after 1922 and the failure of emigration to provide a lasting solution led to an emphasis on manufacturing and foreign trade as a means of providing employment. | 1 |
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| May 6 |
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| A Sino-Japanese tariff agreement was signed in Nanjing by which Japan recognized China's tariff autonomy and received certain commercial safeguards and recognition of Japanese loans to former Chinese governments. | 2 |
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| Oct |
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Japanese ratification of the London Naval Treaty (signed April 22) followed acrimonious debate in which the Seiy kai attacked the policies of Hamaguchi and Shidehara, arousing anger in ultranationalistic quarters. | 3 |
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| Nov. 14 |
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| Prime Minister Hamaguchi was shot by an assassin in Tokyo. | 4 |
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