Before the Division

Korean history begins with the founding of Jo-seon (often known as "Gojoseon" to prevent confusion with another dynasty founded in the 14th century; the prefix Go- means 'old' or 'earlier') in 2333 BC by Dangun, according to Korean foundation mythology.^[11] Gojoseon expanded until it controlled northern Korean Peninsula and some parts of Manchuria. After many conflicts with the Chinese Han Dynasty, Gojoseon disintegrated, leading to the Proto–Three Kingdoms of Korea period.
In the early centuries of the Common Era, Buyeo, Okjeo, Dongye, and the Samhan confederacy occupied the peninsula and southern Manchuria. Of the various states, Goguryeo, Baekje, and Silla grew to control the peninsula as Three Kingdoms of Korea. The unification of the Three Kingdoms by Silla in 676 led to the North South States Period, in which much of the Korean Peninsula was controlled by Unified Silla, while Balhae succeeded the northern parts of Goguryeo.
In Unified Silla, poetry and art was encouraged, and Buddhist culture thrived. Relationships between Korea and China remained relatively peaceful during this time. However, Unified Silla weakened under internal strife, and surrendered to Goryeo in 935. Balhae, Silla's neighbor to the north, was formed as a successor state to Goguryeo. During its height, Balhae controlled most of Manchuria and parts of Russian Far East. It fell to the Khitan in 926.
The peninsula was united by Emperor Taejo of Goryeo in 936. Like Silla, Goryeo was a highly cultural state and created the Jikji in 1377, using the world's oldest movable metal type printing press.^[12] The Mongol invasions in the 13th century greatly weakened Goryeo. After nearly 30 years of war, Goryeo continued to rule Korea, though as a tributary ally to the Mongols. After the Mongolian Empire collapsed, severe political strife followed and the Goryeo Dynasty was replaced by the Joseon Dynasty in 1388 following a rebellion by General Yi Seong-gye.

King Taejo declared the new name of Korea as "Joseon" in reference to Gojoseon, and moved the capital to Seoul. The first 200 years of the Joseon Dynasty were marked by relative peace and saw the creation of Hangul by King Sejong the Great in the 14th century and the rise in influence of Confucianism in the country.
Between 1592 and 1598, the Japanese invaded Korea. Toyotomi Hideyoshi led the forces and tried to invade the Asian continent through Korea, but was eventually repelled by the Righteous army and assistance from Ming Dynasty China. This war also saw the rise of Admiral Yi Sun-sin and his renowned "turtle ship". In the 1620s and 1630s, Joseon suffered from invasions by the Manchu who eventually conquered all of China.
After another series of wars against Manchuria, Joseon experienced a nearly 200-year period of peace. King Yeongjo and King Jeongjo particularly led a new renaissance of the Joseon Dynasty.
However, the latter years of the Joseon Dynasty were marked by a dependence on China for external affairs and isolation from the outside world. During the 19th century, Korea's isolationist policy earned it the name the "Hermit Kingdom". The Joseon Dynasty tried to protect itself against Western imperialism, but was eventually forced to open trade. After the First Sino-Japanese War and the Russo-Japanese War, Korea was occupied by Japan (1910–1945). 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.