Goryeo was invaded from the Mongols in seven key strategies with the 1230s right until the 1270s, but was never conquered.[117] Exhausted following decades of combating, Goryeo sent its crown prince on the Yuan funds to swear allegiance on the Mongols; Kublai Khan approved, and married considered one of his https://jasper8zx5j.jts-blog.com/32933442/korea-options