History of Korea
After the end of WWII in 1945, the Allies divided the country into a northern area (protected by the Soviets) and a southern area protected (primarily by the United States). In 1948, when the powers failed to agree on the formation of a single government, this partition became the modern states of North and South Korea. The peninsula was divided at the 38th Parallel: the "Republic of Korea" was created in the south, with the backing of the US and Western Europe, and the "Democratic People's Republic of Korea" in the north, with the backing of the Soviets and the communist People's Republic of China. The new premier of North Korea, Kim il-Sung, launched the Korean War in 1950 in an attempt to reunify the country under Communist rule. After immense material and human destruction, the conflict ended with a cease-fire in 1953. The two nations officially remain at war because a peace treaty was never signed. In 1991, both states were accepted into the United Nations.
United States involvement in regime change
As the Empire of Japan surrendered in August 1945, under the leadership of Lyuh Woon-Hyung committees throughout Korea formed to coordinate transition to Korean independence. On August 28, 1945 these committees formed the temporary national government of Korea, naming it the People's Republic of Korea (PRK) a couple of weeks later. On September 8, 1945, the United States government landed forces in Korea and thereafter established the United States Army Military Government in Korea (USAMGK) to govern Korea south of the 38th parallel north. The USAMGK staffed the governing administration with Japanese governors and many other Japanese officials who had been part of the brutal Japanese imperial colonial government and with Koreans who had collaborated with it, which made the government unpopular and engendered popular resistance. USAMGK refused to recognize the PRK government, which had been formed to self-govern the country, and the Provisional Government of the Republic of Korea, which had been based in China during WWII and had fought against the Japanese, and then the USAMGK by military decree outlawed the PRK government. In October 1948, USAMGK sent units to attack Koreans who were seeking Korean independence, and carried out several mass atrocities, including the killing hundreds of Korean civilians on Jeju Island who were suspected of supporting those in favor of independence.