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After WWII ends the Soviets takes the side of North Korea and the USA takes the side of South Korea and the Korean War begins. Soviets - Rusia Goverment http://www.bbc.com/news/world-asia-pacific-15278612
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North Korea's Industries grow rapidly which is a good thing for North Korea which means they’re getting bigger and is becoming a bigger threat to the USA.
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Threat - a statement of an intention to inflict pain, injury, damage, or other hostile action on someone in retribution for something done or not done. https://www.google.com/search?q=Timeline+of+north+korea+and+usa&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiK3qiDivzTAhWqgFQKHbkUCbUQ_AUICigB&biw=1440&bih=794&safe=active&ssui=on#imgrc=irLQbRAtR6QMVM http://www.bbc.com/news/world-asia-pacific-15278612
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First ever testing of the Nodong 1 Missile which is 1 of North Korea's early nuclear bombs and could possibly be a threat to the USA. https://www.google.com/search?q=Timeline+of+north+korea+and+usa&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiK3qiDivzTAhWqgFQKHbkUCbUQ_AUICigB&biw=1440&bih=794&safe=active&ssui=on#imgrc=irLQbRAtR6QMVM
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Fires Taepodong missile over Japan which caused rapid panic in Japan. Rapid - happening in a short time or at a fast pace. https://www.google.com/search?q=definition+for+rappid&rlz=1CADEAA_enUS747&oq=definition+for+rappid&aqs=chrome..69i57j0l2.5446j0j1&sourceid=chrome&ie=UTF-8&safe=active&ssui=on https://www.google.com/search?q=Timeline+of+north+korea+and+usa&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiK3qiDivzTAhWqgFQKHbkUCbUQ_AUICigB&biw=1440&bih=794&safe=active&ssui=on#imgrc=irLQbRAtR6QMVM
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Agrees with the UN to freeze testing on long range missiles so that is a huge threat backed down from the USA. Freeze - Stop https://www.google.com/search?q=Timeline+of+north+korea+and+usa&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiK3qiDivzTAhWqgFQKHbkUCbUQ_AUICigB&biw=1440&bih=794&safe=active&ssui=on#imgrc=irLQbRAtR6QMVM
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Agrees to return to NPT and forsake nuclear weapons and changes their mind one day later demands reactor from the US which shows that they still want to have a nuclear program and this is a threat to the USA.
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Demands - an insistent and peremptory request, made as if by right. https://www.google.com/search?q=Timeline+of+north+korea+and+usa&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiK3qiDivzTAhWqgFQKHbkUCbUQ_AUICigB&biw=1440&bih=794&safe=active&ssui=on#imgrc=irLQbRAtR6QMVM https://www.google.com/search?q=definition+for+rappid&rlz=1CADEAA_enUS747&oq=definition+for+rappid&aqs=chrome..69i57j0l2.5446j0j1&sourceid=chrome&ie=UTF-8&safe=active&ssui=on#safe=active&q=definition+for+demands
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America agrees to unfreeze assets and provide aid so the UN decides to help the Koreans and that is a huge threat to the USA. https://www.google.com/search?q=Timeline+of+north+korea+and+usa&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiK3qiDivzTAhWqgFQKHbkUCbUQ_AUICigB&biw=1440&bih=794&safe=active&ssui=on#imgrc=irLQbRAtR6QMVM
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They exchange testing moratorium for aid which means their nuclear program is going down the drain and they need help and this is an amazing thing for the USA. https://www.google.com/search?q=Timeline+of+north+korea+and+usa&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiK3qiDivzTAhWqgFQKHbkUCbUQ_AUICigB&biw=1440&bih=794&safe=active&ssui=on#imgrc=irLQbRAtR6QMVM
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Fifth underground nuclear test, which is a huge threat to the USA. We have placed an embargo on them. We are not alies with them we are enemys because there nucleur program is a threat to the USA Embargo - Don't trade https://www.google.com/search?q=Timeline+of+north+korea+and+usa&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiK3qiDivzTAhWqgFQKHbkUCbUQ_AUICigB&biw=1440&bih=794&safe=active&ssui=on#imgrc=irLQbRAtR6QMVM