History of South Korea
On August 15, 1948, the Republic of Korea was formally established, with Rhee Syngman as the first president. With the establishment of Rhee's government, de jure sovereignty also passed into the new government. On September 9, 1948, a communist regime, the Democratic People's Republic of Korea (North Korea), was proclaimed under Kim Il-sung. However, on December 12, 1948, by its resolution 195 in the Third General Assembly, the United Nations recognized the Republic of Korea as the sole legal government of Korea.
Korea and the United Nations
The Republic of Korea (commonly known as "South Korea") and the Democratic People's Republic of Korea (commonly known as "North Korea") were simultaneously admitted to the United Nations (UN) in 1991. On 8 August 1991, the UN Security Council passed United Nations Security Council Resolution 702, recommending both states to the UN General Assembly for membership. On 17 September 1991, the General Assembly admitted both countries under Resolution 46/1.