was korea part of china?

US Pres. Trump's comments that Chinese President Xi Jinping told him that Korea had been part of China stimulated quick and negative reaction in South Korea (radio report: https://www.pri.org/stories/2017-04-20/trump-outraged-south-koreans-saying-korea-used-be-part-china-he-right; HK newspaper: http://www.scmp.com/news/china/diplomacy-defence/article/2089788/south-koreans-protest-after-trump-says-peninsula-was; Korean paper:http://english.hani.co.kr/arti/english_edition/e_national/791556.html). USC Korea historian Kyung Moon Hwang writes that the problem doesn't start there, but rather with how Chinese history is presented in China, essentially overlooking the messiness of long and complex interactions among the peoples of East Asia, interactions that eventually produced the still-in-flux Chinese, Mongolian, Korean, Japanese, Vietnamese, and other cultures of the region. Read his column here: http://www.koreatimes.co.kr/www/opinion/2017/04/633_228372.html .