History of South Korea
The history of South Korea formally begins with its establishment on August 15, 1948.
History of Seoul
After World War II and Korea's liberation, the city took its present name of "Seoul". When the Republic of Korea (South Korea) was declared, the new state adopted the city as its capital. In 1949, Seoul administrative area expanded to Ui-dong to the north, and Guro-dong and Daerim-dong to the south, recombining some areas which were annexed from original Seoul to Goyang County in 1914.