Final answer:
Kublai Khan was not successful in unifying the Mongol Empire and faced unrest from Chinese subjects during his rule in China.
Step-by-step explanation:
Despite Kublai Khan's dominance in China, his attempts to hold a unified Mongol Empire together were largely in vain. The realm had already begun to unravel by the time he took the reins of power in China.
Not only had a sharp divide occurred when some Mongols converted to Islam, but the empire itself had splintered into four separate sections known as khanates, each governed by a military ruler or governor known as a khan and who linked his ancestry to the sons of Chinggis. Yuan rulers also faced unrest from their Chinese subjects, particularly when a string of weak emperors after Kublai Khan's death in 1294 resulted in a succession crisis that left Yuan leadership vulnerable to revolt.