When did South Korea become a republic?
History of South Korea
The history of South Korea formally begins with its establishment on August 15, 1948.
Yeosu–Suncheon rebellion
After Imperial Japan surrendered to Allied forces on 15 August 1945, the 35-year Japanese occupation of Korea finally came to an end. Korea was subsequently divided at the 38th parallel north, with the Soviet Union assuming trusteeship north of the line and the United States south of the line. In September 1945, Lt. General John R. Hodge established a military government to administer the southern region, which included Jeju Island and the areas in South Jeolla around Yeosu and Suncheon. In December 1945 U.S. representatives met with those from the Soviet Union and United Kingdom to work out joint trusteeship. Due to lack of consensus, however, the U.S. took the “Korean question” to the United Nations for further deliberation. On November 14, 1947, the United Nations General Assembly passed UN Resolution 112, calling for a general election on May 10, 1948 under UNTCOK supervision.