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.
Korean conflict
The Korean conflict is an ongoing conflict based on the division of Korea between North Korea (Democratic People's Republic of Korea) and South Korea (Republic of Korea), both of which claim to be the sole legitimate government of all of Korea. During the Cold War, North Korea was backed by the Soviet Union, the People's Republic of China and their communist allies, while South Korea was backed by the United States and its Western allies. The division of Korea by external powers occurred at the end of World War II, starting in 1945, and tensions erupted into the Korean War, which lasted from 1950 to 1953. When the war ended, both countries were devastated, with utter destruction of much of the countries, but the division remained. North and South Korea continued a military standoff, with periodic clashes. The conflict survived the collapse of the Eastern Bloc of 1989 to 1991 and continues to this day.