Frictions with foreign powers
Frictions with foreign shipping led Japan to take defensive actions from the beginning of the 19th century. Western ships were increasing their presence around Japan due to

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When Commodore Matthew C. Perry's four-ship squadron appeared in Edo Bay(Tokyo Bay) in July 1853, the shogunate was thrown into turmoil. Commodore Perry was fully prepared for hostilities if his negotiations with the Japanese failed, and threatened to open fire if

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The years 1854–1855 saw a dramatic series of earthquakes, known as the Ansei great earthquakes, with 120 major and minor temblors recorded over a less than two-year period including

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Collapse of the Japanese economy
The opening of Japan to uncontrolled foreign trade brought massive economic instability. While some

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Several missions were sent abroad by the Bakufu, in order to revise the commercial treaties. These efforts towards revision remained largely

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Belligerent opposition to Western influence further erupted into open conflict when the Emperor Kōmei, breaking with centuries of imperial tradition, began to take an active role in

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Following the nomination of Townsend Harris as the U.S. Consul in 1856 and two years of negotiation, the Treaty of Amity and Commercewas signed in 1858 and put into application from

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