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In page Busan:

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As Busan was one of the few areas in Korea that remained under the control of South Korea throughout the Korean War, for some time it served as a de facto capital of South Korea.[citation needed] UN troops established a defensive perimeter around the city known as the Pusan Perimeter in the summer and fall of 1950. Since then, the city has been a self-governing metropolis and has built a strong urban character.