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.
History of South Korea
The two parties were unable to agree on the implementation of Joint Trusteeship over Korea. This led in 1948 to the establishment of two separate governments – the Communist-aligned Democratic People's Republic of Korea (DPRK) and the West-aligned First Republic of Korea – each claiming to be the legitimate government of all of Korea. On June 25, 1950 the Korean War broke out. After much destruction, the war ended on July 27,1953 with the 1948 status quo being restored, as neither the DPRK nor the First Republic had succeeded in conquering the other's portion of the divided Korea. The peninsula was divided by the Korean Demilitarized Zone and the two separate governments stabilized into the existing political entities of North and South Korea.