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.
Aegukga
"Aegukga" (, ), often translated as "The Patriotic Song", is the national anthem of South Korea. It was adopted in 1948, the year the country was founded. Its music was composed in the 1930s and its lyrics date back to the 1890s. The lyrics of "Aegukga" were originally set to the music of the Scottish song "Auld Lang Syne" before Ahn Eak-tai composed a unique melody specifically for it in 1935. Before the founding of South Korea, the song's lyrics, set to the music of "Auld Lang Syne", was sung, as well as during Korea under Japanese rule by dissidents. The version set to the melody composed by Ahn Eak-tai was adopted as the national anthem of the Korean exile government, which existed during Korea's occupation by Japan from the early 1910s to the mid-1940s.