LIST OF WARS: DETAILS
Also called: 전쟁
Battle deaths: 995,025 
Nation(s) involved and/or conflict territory [note]
United States, China, North Korea, South Korea, Australia
It was primarily the result of the political division of Korea by an agreement of the victorious Allies at the conclusion of the Pacific War at the end of World War II. The Korean Peninsula was ruled by the Empire of Japan from 1910 until the end of World War II. Following the surrender of the Empire of Japan in September 1945, American administrators divided the peninsula along the 38th parallel, with U.S. military forces occupying the southern half and Soviet military forces occupying the northern half.
The failure to hold free elections throughout the Korean Peninsula in 1948 deepened the division between the two sides; the North established a communist government, while the South established a right-wing government. The 38th parallel increasingly became a political border between the two Korean states. Although reunification negotiations continued in the months preceding the war, tension intensified. Cross-border skirmishes and raids at the 38th Parallel persisted. The situation escalated into open warfare when North Korean forces invaded South Korea on 25 June 1950. In 1950, the Soviet Union boycotted the United Nations Security Council. In the absence of a veto from the Soviet Union, the United States and other countries passed a Security Council resolution authorizing military intervention in Korea.
The U.S. provided 88% of the 341,000 international soldiers which aided South Korean forces, with twenty other countries of the United Nations offering assistance. Suffering severe casualties within the first two months, the defenders were pushed back to the Pusan perimeter. A rapid U.N. counter-offensive then drove the North Koreans past the 38th Parallel and almost to the Yalu River, when the People’s Republic of China (PRC) entered the war on the side of North Korea. Chinese intervention forced the Southern-allied forces to retreat behind the 38th Parallel. While not directly committing forces to the conflict, the Soviet Union provided material aid to both the North Korean and Chinese armies. The fighting ended on 27 July 1953, when the armistice agreement was signed. The agreement restored the border between the Koreas near the 38th Parallel and created the Korean Demilitarized Zone (DMZ), a 2.5-mile (4.0 km)-wide fortified buffer zone between the two Korean nations. Minor incidents still continue today.
Source: Wikipedia, published under the GNU FDL. Retrieved 2013-08-26
Republic of Korea established a Truth and Reconciliation Commission on the 1st of December 2005: "To reveal the truth of our history, we investigate past incidents, such as anti-Japanese movements during Japanese rule, the history of Koreans residing abroad before and after the Korean War, and civilian massacres that occurred from August 15, 1945 to the end of the authoritarian regimes." Source: jinsil.go.kr
SOURCES: FATALITY DATA
 Battle deaths: PRIO Battle Deaths Dataset v3.0 (link) (1946-88) ID: #38
Low: 644,721 High: 1,500,999
Matthew White estimates 2,500,00 to 3,000,000 deaths including battle-deaths (link). Several hundred thousands of Nort Korean and South Korean civilians died of battle-related causes, onesided violence, famine or disease.
For an article on civilian deaths during the Korean War see: Kim Dong-choon, "The Truth and Reconciliation Commission of Korea: Uncovering the Hidden Korean War," The Asia-Pacific Journal, 9-5-10, March 1, 2010. jinsil.go.kr
NOTE ON NATION DATA
NOTE! Nation data for this war may be inconlusive or incomplete. In most cases it reflects which nations were involved with troops in this war, but in some it may instead reflect the contested territory.
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