Goryeo was invaded because of the Mongols in 7 important strategies from the 1230s till the 1270s, but was in no way conquered.[117] Exhausted right after a long time of preventing, Goryeo sent its crown prince on the Yuan funds to swear allegiance on the Mongols; Kublai Khan approved, and https://louis8wv3f.blogmazing.com/33089167/korea-options