What are the factors motivated the grand ocean expeditions of zheng he across asia?

Power of China shown to the world

Demonstrate the strength of the Ming Dynasty.

Explanation:

Zheng He expeditions were funded by the Ming Dynasty, under the leadership of Emperor Zhu Di, were aimed to enforce and affirm China as a superior power in the world. Emperor Zhu Di wanted to show the Ming Dynasty as a strong entity to the world. He mainly wanted to assert authority over China's neighbouring countries and maintain the perception of being a strong country to worldwide regions.

He brought back the tribute system. He started several voyages and the built a lot of great ships. The ships could carry over 25,000 men and 2,500 tons of cargo. He went on voyages the East African Coast. The expeditions demonstrated the Ming Dynasty's prowess in navigation and building of ships.