1September 2, 945, according to the allied agreement, MacArthur, the supreme commander of the allied forces, in the first instruction, took the 38th parallel north as the temporary dividing line for the US and Soviet armies to accept the surrender of Japanese troops stationed in South Korea and carry out military activities against Japan, with the surrender area of Soviet troops stationed in South Korea in the north and the surrender area of American troops in the south. After Japan surrendered, American and Soviet troops were stationed in the north and south of the 38th parallel. 1948 In August and September, the Republic of Korea and the Democratic People's Republic of Korea were successively established in the north and south of the Korean peninsula. In June+10, 5438, the Soviet Union handed over the administrative power north of the 38th parallel to the North Korean government. By June+February, 65438, all Soviet troops had withdrawn. Half a year later, the US military also announced its withdrawal from South Korea, but left behind civilian officials and a "military advisory group". At that time, the total population of the Korean Peninsula was 30 million, the population south of the 38th parallel was about 2 1 10,000, and the population north of the 38th parallel was 9 million. The areas occupied by the North and the South account for 56% and 44% of the total area of the Korean Peninsula respectively.

1The Korean War broke out on June 25th, 950. On the 27th, the United States officially entered the war. By mid-August, the Korean People's Army had driven the US and South Korean troops to a corner of Busan and captured 90% of South Korea's land. On September 15, the United Nations forces, mainly American troops, landed at Incheon Port on the west coast of the Korean Peninsula and began a large-scale counterattack. At the same time, American planes repeatedly bombed and strafed the northeast border of China (accused by the US Air Force of accidental bombing), which seriously threatened the security of China. Chinese people's Volunteer Army 10 10 went to the DPRK on October 25th to fight side by side with the Korean People's Army and drive the enemy back from the Yalu River to the vicinity of the 38th parallel. 195 10 On July 25th, the U.S. government was forced to agree to hold armistice negotiations in Kaesong and signed an armistice agreement on July 27th, 1953. The whole Korean War lasted for three years.

1in July, 953, the north-south military demarcation line was adjusted on the basis of the 38th parallel, and the demilitarized zone was demarcated within two kilometers on each side of the temporary military demarcation line. It is still customarily called the 38th parallel. 1 953 65438+1October1,the United States and South Korea signed the Korea-US Joint Defense Treaty, according to which the United States stationed troops in South Korea for a long time. 1958101On October 26th, Chinese people's Volunteer Army completely withdrew from the Korean peninsula.