Formerly a single nation that was annexed by Japan in 1910, the Korean Peninsula has been divided into North Korea and South Korea since the end of World War II on 2 September 1945. The two governments were founded in the two regions in 1948, leading to the consolidation of division. The two countries engaged in the Korean War from 1950 to 1953 which ended in an armistice agreement but without a peace treaty. North Korea is a one-party totalitarian state run by the Kim dynasty. South Korea was formerly governed by a succession of military dictatorships, save for a brief one-year democratic period from 1960 to 1961, until thorough democratization in 1987, after which direct elections were held. Both nations claim the entire Korean peninsula and outlying islands. Both nations joined the United Nations in 1991 and are recognized by most member states. Since the 1970s, both nations have held informal diplomatic dialogues in order to ease military tensions.
In 2000, President Kim Dae-jung became the first President of South Korea to visit North Korea, 55 years after the peninsula was divided. Under President Kim, South Korea adopted the Sunshine Policy in pursuit of more peaceful relationships with North Korea. The policy established the Kaesong Industrial Region, among other things. This policy was continued by the next president Roh Moo-hyun who also visited North Korea in 2007 and met with North Korean leader Kim Jong Il. Through this meeting both leaders signed a declaration to pursue peace and recover inter-Korean relations. However, faced with growing criticism, the Sunshine Policy was discontinued under the next two governments. During Lee Myung-bak and Park Geun-Hye's presidencies, the relationship between North and South Korea became more hostile.
In 2018, beginning with North Korea's participation in the 2018 Winter Olympics, the relationship has seen a major diplomatic breakthrough and become significantly warmer. In April 2018, the two countries signed the Panmunjom Declaration for Peace, Prosperity and Unification of the Korean Peninsula. In 2018, a majority of South Koreans approved the new relationship. The summits between North and South Korea have also facilitated positive relationships between North Korea and the United States. However, tensions between the two countries remain.
Division of Korea
The Korean peninsula had been occupied by Japan from 1910. On 9 August 1945, in the closing days of World War II, the Soviet Union declared war on Japan and advanced into Korea. Though the Soviet declaration of war had been agreed by the Allies at the Yalta Conference, the US government became concerned at the prospect of all of Korea falling under Soviet control. The US government therefore requested Soviet forces halt their advance at the 38th parallel north, leaving the south of the peninsula, including the capital, Seoul, to be occupied by the US. This was incorporated into General Order No. 1 to Japanese forces after the Surrender of Japan on 15 August. On 24 August, the Red Army entered Pyongyang and established a military government over Korea north of the parallel. American forces landed in the south on 8 September and established the United States Army Military Government in Korea.
The Allies had originally envisaged a joint trusteeship which would steer Korea towards independence, but most Korean nationalists wanted independence immediately. Meanwhile, the wartime co-operation between the Soviet Union and the US deteriorated as the Cold War took hold. Both occupying powers began promoting into positions of authority Koreans aligned with their side of politics and marginalizing their opponents. Many of these emerging political leaders were returning exiles with little popular support. In North Korea, the Soviet Union supported Korean Communists. Kim Il Sung, who from 1941 had served in the Soviet Army, became the major political figure. Society was centralized and collectivized, following the Soviet model. Politics in the South was more tumultuous, but the strongly anti-Communist Syngman Rhee emerged as the most prominent politician.