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In page Jiandao:

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After World War II and the liberation of Korea, many Korean expatriates in the region moved back to Korea, but a significant majority still remained in Manchuria; descendants of these people form much of the Korean ethnic minority in China today. The area was first nominally part of the Republic of China's new Songjiang Province but with the communist seizure of power in 1949, Sonjiang's borders were changed and Jiandao became part of Jilin Province.