Final answer:
Kublai Khan's reign faced resistance to Mongol rule due to internal fractures within the Mongol Empire, succession crises, and dissatisfaction among Chinese subjects over governance and cultural differences.
Step-by-step explanation:
The conclusion supported by Kublai Khan's protests is Resistance to Mongol rule. Despite Kublai Khan's efforts, the Mongol Empire was experiencing a decline, accelerated by his death and the subsequent weak governance which led to succession crises. The division among Mongols between adopting a settled lifestyle and maintaining nomadic traditions also created internal tensions. Moreover, the Mongol taxation system and military failures deepened resentment among Chinese subjects, who viewed Mongol rule as foreign and their customs as inferior. These factors collectively contributed to resistance against Mongol domination.