British Korea was occupied by the Japanese during World War II, but the British regained it after the war. The Soviets demanded control of Northern Korea, but the British wished it to stay unified. As a compromise, British Korea remained unified while Japan was split into a Communist North and a Democratic South. Korea officially gained independence from the British in the 1970s.
Also, since I know someone will say it, British Korea is Best Korea.
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Sam McDonald is a college student from Shreveport, LA. When not involved with his studies he can be found making and posting maps across the web and working on short stories that he hopes to have published in magazines such as Lightspeed, Strange Horizons, and the Escape Artists Podcasts.