(CNN) -- Here's a look at what you need to know about the Korean War. July 27, 2013 marks 60 years since the signing of the armistice agreement that ended the fighting.
Causes of the Korean War Under Japanese rule before and during World War II, Korea was divided into two parts after the Japanese surrender. The Soviet Union occupied the area north of the 38th parallel and the United States occupied the area south until 1948.
Two new ideologically opposite countries were established in 1948.
North Korea want reunification under communist rule.
Facts The first war in which the U.N. played a role. When asked to send military aid to South Korea sixteen countries sent troops and 41 sent equipment or aid. China fought on the side of North Korea and the Soviet Union sent them military equipment.
The U.S. sent about 90% of the troops that were sent to aid South Korea.
The first war with battles between jet aircraft.
The U.S. spent around $67 billion on the war.
The truce talks lasted two years and 17 days.
The casualty toll had been reported as 54,246 until June 2000, when the Pentagon acknowledged that a clerical error had included deaths outside the Korean War theater in the total.
There are more than 7,500 American soldiers still "unaccounted for from the Korean War" as of June 2014.
There has never been a peace treaty, so the Korean War has technically never ended.
U.S. Troops Statistics Source: Dept. of Defense U.S. Deaths: Hostile: 33,739 Non-Hostile: 2,835 Total In-Theatre: 36,574 U.S. Wounded in Action - 103,284
Other Casualties by Country (killed and missing) Source: Encyclopedia Britannica South Korea - (217,000 military, 1,000,000 civilian) North Korea - (406,000 military, 600,000 civilian) China - (600,000 military)
Timeline November 1947 - The United Nations General Assembly approves elections to be held throughout Korea to choose a provisional government for the entire county. The Soviet Union opposed this.
May 10, 1948 - The people of South Korea elect a national assembly. The assembly set up the government of the Republic of Korea. The people of north refused to take part.
September 9, 1948 - North Korean Communists establish the Democratic People's Republic of Korea.
June 25, 1950 - 135,000 soldiers from the communist North Korean People's Army (NKPA) cross the 38th parallel and invade Republic of Korea (ROK).
June 25, 1950 - The U.N. Security Council denounces North Korea's actions and called for a cessation of hostilities and withdrawal of the NKPA to the 38th parallel.
June 26, 1950 - U.S. President Harry S. Truman directs General Douglas MacArthur to evacuate American dependents from Korea and to assist the ROKA.
June 30, 1950 - Truman orders ground troops into action.
July 1950 - In the first month of the war, U.S. soldiers kill significant numbers of Korean civilians under a bridge, near a village called No Gun Ri. It is unclear whether the soldiers were ordered to kill civilians or acted on their own.
July 5, 1950 - For the first time since the end of World War II U.S. troops go into battle, at Osan, 30 miles south of Seoul. The first American casualty of the Korean War dies here, Private Kenneth Shadrick of West Virginia.
June 23, 1951 - Jacob Malik, a Soviet delegate to the U.N., proposes a cease-fire
July 10, 1951 - Truce talks begin at Kaesong
October 25, 1951 - Truce talks are moved to Panmunjom.
November 27, 1951 - Both sides agree that the existing battle lines would be the final dividing line between North and South Korea if a truce is reached in 30 days.
April 1952 - Truce talks are deadlocked over voluntary repatriation.
October 8, 1952 - Truce talks are adjourned.
April 26, 1953 - Truce talks are resumed and the Communists agree to voluntary repatriation.
July 27, 1953 - Democratic People's Republic of Korea (north), Chinese People's Volunteers and the UN sign an armistice agreement. The Republic of Korea refused to sign. However hostilities ceased within 12 hours.
July 27, 1953 - Terms of the armistice include creation of the demilitarized zone, DMZ. Each side is 2,200 yards form a center point. The DMZ is patrolled by both sides at all times.
1990-1994 - North Korea recovers remains claimed to be 208 American servicemen.
2007 - Four sets of American servicemen remains are delivered to U.N. honor guards in Panmunjon
2011 - The remains of 26 U.S. Korean War servicemembers that had been listed as MIA are identified.
2012 - The remains of 40 U.S. Korean War servicemembers are identified.
January-May 2013 - Fifteen U.S. MIA Korean War servicemembers are identified.
June 2013-April 2014 - The remains of 49 U.S. military servicemembers unaccounted for after the Korean War are identified.