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.
List of Presidents of South Korea
Prior to the establishment of the First Republic in 1948, the Provisional Government of the Republic of Korea established in Shanghai in September 1919 as the continuation of several governments proclaimed in the aftermath of March 1st Movement earlier that year coordinated Korean people's resistance against Japan during the Japanese occupation of Korea. The legitimacy of the Provisional Government has been recognised and succeeded by South Korea in the latter's original Constitution of 1948 and the current Constitution of 1988. Nine people have served twenty-four terms as Heads of State (with varying titles) of the Provisional Government between September 1919 and August 1948.