The Korean War (in South Korean Hangul: , Hanja: , Hanguk Jeonjaeng, "Korean War"; in North Korean Chosungul: , Joguk Haebang Jeonjaeng, "Fatherland Liberation War"; 25 June 1950 27 July 1953)[a] was started when North Korea invaded South Korea. The United Nations, with United States as the principal force, came to aid of South Korea. China, along with assistance from Soviet Union, came to aid of North Korea. The war arose from the division of Korea at the end of World War II and from the global tensions of the Cold War that developed immediately afterwards.
What country was divided at the end of World War II?
Korea