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The US came to Japan and opened up its self-imposed isolation towards foreign influence that had went on for over 200 years.
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End of the many centuries of rule by the Shogun Military Castle, the Empire of Japan is declared, the country then enters a rapid period of industrialisation and trading dominance over Asia
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Japan joins World War I on the side of Britain, gaining some Pacific islands from Germany at the end of the war.
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Japan tries to establish buffer zone (a neutral area to separate
hostile forces/nations) against Bolshevik regime in Russia's Pacific provinces and is pushed out by British and US diplomatic pressure and domestic opposition. -
Extreme nationalism begins to take hold in Japan as world economic depression hits. The emphasis is on a preservation of traditional Japanese values, and a rejection of "Western" influence.
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Start of Second World War in Europe. With the fall of France in 1940, Japan moves to occupy French Indo-China.
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Japan launches a surprise attack on US Pacific fleet at Pearl Harbor, Hawaii. US and main allies declare war on Japan.
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US planes drop two atomic bombs on Hiroshima and Nagasaki in August. Emperor Hirohito surrenders. Japan placed under US military government.