00:00How did Korea's territory change over time?
00:02Korea was originally made up of three kingdoms, Goguryeo, Bayekje, and Silla.
00:07Silla united most of the peninsula, but former Goguryeo people established Balhae across northern Korea and Manchuria.
00:15As Silla weakened, Goryeo emerged and united the peninsula, while Balhae was conquered by the Khitans.
00:21The Mongols later turned Goryeo into their vassal.
00:24Then Joseon overthrew Goryeo and expanded north to roughly where the border is today.
00:30Centuries later, Korea fell under Japanese influence and was annexed in 1910.
00:36After World War II, Korea was divided into the communist north and democratic south.
00:42The north attacked the south and almost defeated it, but U.S.-led forces pushed the north almost to the Chinese
00:48border.
00:48China then intervened and pushed them back, with the front stabilizing around the original border.
00:54An armistice was signed in 1953, but the countries technically remain at war to this day.