South Korea–United States relations
Following Japanese surrender at the end of the Second World War, the Allied Powers divided the Korean peninsula along the 38th Parallel with two occupation zones with the United States in the south, and the Soviet Union in the north that would later become North Korea. On August 15, 1948, the southern half of Korea declared independence as the Republic of Korea with Syngman Rhee as president. The United States recognized the Republic of Korea as an independent state on January 1, 1949 and diplomatic relations between two countries were established on March 25 in the following year.
Cross-border skirmishes and raids at the 38th Parallel escalated into open warfare when the North Korean forces invaded South Korea on June 25, 1950. The Korean War broke out when North Korea invaded South Korea. In response, 16 member countries of the United Nations, including the United States, came to the defense of South Korea. It was the first significant armed conflict of the Cold War with extensive deployment of American and other troops.
History of Korea
In December 1945, a conference convened in Moscow to discuss the future of Korea. A 5-year trusteeship was discussed, and a joint Soviet-American commission was established. The commission met intermittently in Seoul but members deadlocked over the issue of establishing a national government. In September 1947, with no solution in sight, the United States submitted the Korean question to the United Nations General Assembly. On December 12, 1948, the General Assembly of the United Nations recognised the Republic of Korea as the sole legal government of Korea.