Final answer:
Zhu Zanji's decision to end Zheng He's voyages was influenced by a spirit of isolationism in the Chinese court and the need to save money.
Step-by-step explanation:
One possible reason for Zhu Zanji's decision to end the voyages of Zheng He was a spirit of isolationism in the Chinese court under Zhu Zanji. This means that Zhu Zanji wanted to focus on internal affairs and limit interactions with other countries.
Another reason was to save money and avoid the expense of the voyages. Both of these factors contributed to Zhu Zanji's decision to end Zheng He's voyages.