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*1840/7 Representatives of the [[Dutch East India Company]] arrive at [[Nagasaki]] and inform of the outbreak of the [[Opium War]].
*1840/7 Representatives of the [[Dutch East India Company]] arrive at [[Nagasaki]] and inform of the outbreak of the [[Opium War]].
*1840/9 [[Takashima Shuhan|Takashima Shûhan]] offers a proposal to the shogunate on the production and use of artillery.
*1840/9 [[Takashima Shuhan|Takashima Shûhan]] offers a proposal to the shogunate on the production and use of artillery.
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*1840/11 ''[[Sanboryochigae|Sanbôryôchigae]]'' - The daimyo of [[Shonai han]] (Dewa province), [[Kawagoe han]] (Musashi province), and [[Nagaoka han]] (Echigo province) are moved to one another's territories.
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*1840/11 ''[[Sanboryochigae|Sanbôryôchigae]]'' - The daimyo of [[Shonai han|Shônai]] (Dewa province), [[Kawagoe han]] (Musashi province), and [[Nagaoka han]] (Echigo province) are moved to one another's territories. Following violent resistance by the people of Shônai, the order is withdrawn.
==Other Events of 1840==
==Other Events of 1840==