However, the Mongol invasions in the 13th century greatly weakened the kingdom. Goryeo was never conquered by the Mongols, but exhausted after three decades of fighting, the Korean court sent its crown prince to the Yuan capital to swear allegiance to Kublai Khan, who accepted, and married one of his daughters to the Korean crown prince. Henceforth, Goryeo continued to rule Korea, though as a tributary ally to the Mongols for the next 86 years. During this period, the two nations became intertwined as all subsequent Korean kings married Mongol princesses, and the last empress of the Yuan dynasty was a Korean princess. In the mid-14th century, Goryeo drove out the Mongols to regain its northern territories, briefly conquered Liaoyang, and defeated invasions by the Red Turbans. However, in 1392, General Yi Seong-gye, who had been ordered to attack China, turned his army around and staged a coup.
Yi Seong-gye declared the new name of Korea as “Joseon” in reference to Gojoseon, and moved the capital to Hanseong (one of the old names of Seoul). The first 200 years of the Joseon dynasty were marked by peace, and saw great advancements in science and education, as well as the creation of Hangul by Sejong the Great to promote literacy among the common people. The prevailing ideology of the time was Neo-Confucianism, which was epitomized by the seonbi class: nobles who passed up positions of wealth and power to lead lives of study and integrity.
Between 1592 and 1598, Toyotomi Hideyoshi launched invasions of Korea, but his advance was halted by Korean forces (most notably the Joseon Navy led by Admiral Yi Sun-sin and his renowned “turtle ship”) with assistance from Righteous Army militias formed by Korean civilians, and Ming dynasty Chinese troops. Through a series of successful battles of attrition, the Japanese forces were eventually forced to withdraw, and relations between all parties became normalized. However, the Manchus took advantage of Joseon’s war-weakened state and invaded in 1627 and 1637, and then went on to conquer the destabilized Ming dynasty. After normalizing relations with the new Qing dynasty, Joseon experienced a nearly 200-year period of peace. Kings Yeongjo and Jeongjo particularly led a new renaissance of the Joseon dynasty during the 18th century. In the 19th century, the royal in-law families gained control of the government, leading to mass corruption and weakening of the state, and severe poverty and peasant rebellions throughout the country. Furthermore, the Joseon government adopted a strict isolationist policy, earning the nickname “the hermit kingdom”, but ultimately failed to protect itself against imperialism and was forced to open its borders. After the First Sino-Japanese War and the Russo-Japanese War, Korea was occupied by Japan (1910–45). At the end of World War II, the Japanese surrendered to Soviet and U.S. forces who occupied the northern and southern halves of Korea, respectively.
Modern History:
Despite the initial plan of a unified Korea in the 1943 Cairo Declaration, escalating Cold War antagonism between the Soviet Union and the United States eventually led to the establishment of separate governments, each with its own ideology, leading to the division of Korea into two political entities in 1948: North Korea and South Korea. In the South, Syngman Rhee, an opponent of communism, who had been backed and appointed by the United States as head of the provisional government, won the first presidential elections of the newly declared Republic of Korea in May. In the North, however, a former anti-Japanese guerrilla and communist activist, Kim Il-sung was appointed premier of the Democratic People’s Republic of Korea in September.