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America dropped the world's first nuclear bomb on Hiroshima, Japan.
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Three days after America dropped the first nuclear bomb on Hiroshima, America would drop another bomb on Nagasaki, Japan.
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After the U.S. tested its first hydrogen bomb on the bikini atoll, a fisherman swam in the fallout and died from the radiation. This would create a massive anti nuclear movement in Japan from the public and the government.
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In 1976, the NDPO (Japan's National Defense Program Outline) proposed that Japan would be protected from nuclear threats by America. This would be confirmed by the cabinet during the same year.
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Tokyo creates the "U.S.-Japan Joint Declaration of Security". This declaration explains the roles of the alliance and that America will continue protecting Japan from nuclear threats.
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North Korea starts to develop a nuclear arsenal in the early 2000's. This is when the U.S. started pondering the idea of Japan building their own nuclear arsenal.
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In both 2006 and 2009, Japan's neighboring country North Korea tested nuclear missiles. After the testings, Japan's people started publicly debating about whether Japan should start developing their own missiles.
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After 2 major earthquakes, the Fukushima meltdown occurred. This meltdown killed many people and also would lead to cancer in the future. This made Japan become more against nuclear weapons. http://www.bbc.com/news/world-asia-pacific-12874198
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Japan was ranked in the top 10 strongest militaries in the entire world. If Trump's plan is carried out, they have a strong enough military to inflict damage on America.
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Trump wants to stop protecting Japan from nuclear threats. This could cause many issues throughout Asia and potentially for America. http://www.newsy.com/videos/obama-on-trump-s-plan-to-give-out-nukes-he-doesn-t-know-much/
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After hearing about Trump's idea about making Japan and South Korea build their own nuclear arsenal, Japan commented that the foreign policy was the main reason that the two countries were allies. http://www.cnn.com/videos/world/2016/03/29/south-korea-japan-donald-trump-nuclear-weapons-hancocks.cnn
