http://shanghaiist.com/2017/04/20/trump_says_korea_part_of_china.php

Trump angers Koreans by saying Korea 'used to be part of China' following history lesson from Xi
by Alex Linder in News on Apr 20, 2017 5:45 pm

While the history of relations between China and Korea is complicated, including a number of wars and invasions, Koreans generally bristle at the thought that they were ever part of China. For centuries, Korea was part of China's tributary system, paying for protection from its giant neighbor, just like many other kingdoms including Vietnam and Thailand. But parts of Korea were very rarely under anything resembling direct Chinese control -- the notable exceptions being when the Han dynasty set up four "commanderies" in the northern part of Korea in the second century BC and when both were put under Mongol rule in the 13th century AD.
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