Respuesta :

emilyer
The vulnerability to invaders from the north contributed greatly to the fall of the Song Dynasty.

Answer:

The vulnerability to invaders from the north.

Explanation:

Huizong (dubbed the "Imperial Dreamer") didn't do anything to stop the northern invaders. He invested most of his time in the arts rather than defending the empire, which led to the end of the Song dynasty in A.D. 1279, and the beginning of the Mongol dynasty.