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–United States relations
On September 9, 1948, Kim Il-sung declared the Democratic People's Republic of Korea; he promptly received diplomatic recognition from the Soviet Union, but not the United States. The U.S. did not extend, and has never extended, diplomatic recognition to the DPRK. Kim Il-Sung's anti-American rhetoric often asserted that the U.S. was a capitalist imperialist successor to Japan, a view the country still holds today. In December 1950, the United States initiated economic sanctions against the DPRK under the Trading with the Enemy Act, which lasted until 2008.