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Koreans developed improved versions of many advanced innovations such as the metal movable type printing press, which used to print and publish the Jikji, the world's oldest extant movable metal type printed paper book in 1377.
In the 15th century, Koreans had one of the highest living standards in the world, and Sejong the Great invented Hangul to promote literacy amongst the general Korean population, enabling anyone to easily learn to read and write and transfer written information rather than spend years in learning complicated Hanja.
In 936, the Later Three Kingdoms were united by Wang Geon, a descendant of Goguryeo nobility, Balhae had fallen to the Khitan Empire in 926, and a decade later the last crown prince of Balhae fled south to Goryeo, where he was warmly welcomed and included into the ruling family by Wang Geon, thus unifying the two successor nations of Goguryeo.
The new official name has its origin in the ancient country of Gojoseon (Old Joseon).
In 1897, the Joseon dynasty changed the official name of the country from Joseon to Daehan Jeguk (Korean Empire).
Thus, its force was diminished and it only served as a trade center until it was conquered by Goguryeo in 313.
During the period known as the Proto–Three Kingdoms of Korea, the states of Buyeo, Okjeo, Dongye, and Samhan occupied the Korean peninsula and southern Manchuria.