1950:
- June 25: North Korea invades South Korea.
- June 27: The United States enters the war in support of South Korea.
- September 15: The United Nations forces land at Inchon and retake Seoul.
- October 19: UN forces reach the Yalu River, the border between North Korea and China.
- October 25: China enters the war on the side of North Korea.
1951:
- January 4: The Chinese launch a major offensive and drive the UN forces back.
- April 21: The UN forces launch a counter-offensive and retake Seoul.
- June 23: The fighting reaches a stalemate along the 38th parallel, which had been the border between North and South Korea before the war.
1952:
- July 27: The Korean Armistice Agreement is signed, ending the fighting.
1953:
- July 27: North and South Korea sign the Korean Armistice Agreement, officially ending the war.
- November 17: The United Nations General Assembly passes a resolution calling for the reunification of Korea.
The Korean War ended in a stalemate, with North and South Korea still divided. The war is considered to be one of the deadliest conflicts of the 20th century, with millions of people killed.