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The successful testing of the atomic bomb gave confidence to the Soviets in rivaling the US as a superpower, causing the end of the monopoly.
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The Chinese Communist managed to defeat the Kuomintang forces over China, becoming the second communist power in the world. This also gave a boost to Stalin over the probability of taking over Korea.
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Dean Archeson's defense perimeter speech did include South Korea in the area of protection, hence leading Stalin and Kim to assume that it would safe to invade.
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Armed clashes actually occurred during the period before the star of the korean war, and it was reported that the U.S government aknowleged that majority was instigated by the South Koreans
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Kim II Sung's attempts to repeatedly persuade Stalin to agreee to the invasion plans was rejected until the previous events convinced the Soviets that it could be done with reprecussions from the US.
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Park Hon Yong, the south korean communist's critisim of Kim possibly pushed KIm II Sung to invade in order to prove himself as the foremost korean communist.
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The reappraisal of the NSC demonstrated the underlying continuity of the American Policy, of the definition of the Soviet Threat. Examples of these are a subtantial increase in military strength.
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Syngman Rhee has a near breakdown on hearing about the outbreak of the Korean War, showing he could not have been responsible for it,
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North Korea, without due warning, invades the South. This could have been to show that the North and Kim was the one responsible.
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Historian James Matray argues that if North Korea did not plan for the unification, there would be no invasion of South Korea.