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.
North Korea–South Korea relations
North Korea–South Korea relations is very special with high conflicts. Originally a single nation, the two nations have been divided since the Korean War in 1953. North Korea is an one-party state run by Kim's regime. South Korea was formerly govern by one-party military dictatorships until 1987 when it held direct elections till now. Both nations claim to represent Korea. Both nations joined the United Nations in 1991 and recognized by most of the member states in the United Nations. Since 1970s, both nations start informal diplomatic dialogues in order to reduce military tensions. Since North Korea develops nuclear weapons, which raise concern by the international communities. In 2000, President of South Korea Kim Dae-jung became the first president to visit North Korea, after 55 years of North-South divisions in the peninsula.