Trump’s claim that Korea ‘actually used to be a part of China’

This claim was largely buried in news coverage of Trump’s wide-ranging interview with the Journal, during which he made numerous flip-flops on several policy areas. But it belatedly went viral in South Korea after a Quartz article Tuesday drew attention to it...
https://www.washingtonpost.com/news/fact-checker/wp/2017/04/19/trumps-claim-that-korea-actually-used-to-be-a-part-of-china/