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after WWII, communist Chinese Communist Party ( CCP ) and non-communist Kuomintang ( KMT ) continued to fight for control over China, ending with communist victory
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North Korea was left under the control of Kim Il Sung's communist Democratic People's Republic of Korea ( DPRK )
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South Korea was left under the control of Syngman Rhee's democratic Republic of Korea ( ROK )
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South Korean warships attacked North Korean warships at the Taedong River
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the USSR successfully denoted its first atomic bomb, reaching military parity with the US
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Chinese Communist Party overthrew the Kuomintang and China became a communist state
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In the US Defence Perimeter SPeech, the US declared that the US containment policy would not include South Korea.
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North Korea crossed the 38th parallel and attacked South Korea, triggering the Korean War.