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.
Citizenship in North Korea
North Korea adopted a nationality law in 1963: 15 years after being founded on September 9, 1948. It has since been revised in 1995 and 1999. The nationality law of the Democratic People's Republic of Korea (DPRK) governs who is a citizen of the DPRK, and how one may gain or lose such citizenship. It prescribes citizenship qualifications, citizen rights, and citizen protections. While containing just 16 articles, it covers most of the basic features which can be found across modern citizenship legislation in other nations. Furthermore, North Korean nationality law incorporates anyone who resided in the country since the foundation of the DPRK. This includes varied groups due to the DPRK's annexation by Japan and the United States, occupation by the Soviet Union and final surrender to the Allies in 1945. The law assumes that people registered in North Korea became nationals of North Korea.