Why was Zheng He's voyage to the West abolished during the reign of Emperor Xuanzong of Ming Dynasty?

After the death of Ming Taizu Chengzu, Prince Zhu Gaochi succeeded to the throne. He was Emperor Renzong. And stop Zheng He's voyages to the West and foreign wars to save the people's strength. Encourage production, forgive prisons and practise economy. After the death of Emperor Renzong, Zhu Zhanji, the eldest son, acceded to the throne. He was Emperor Xuanzong of the Ming Dynasty. Xuanzong basically inherited his father's footsteps, continued to let Zheng He go to the West, ruled the country by virtue, and made the country stronger. During this period, the rule that the eunuch left by Taizu was not allowed to take charge of the government was broken, and some eunuchs began to take charge of the government, which laid a hidden danger for the eunuch's authoritarian power in the British Zong period.

Why did Emperor Renzong of the Ming Dynasty abolish the national policy of sending Zheng He to the West? Why did Xuanzong later resume the national policy of sending Zheng He to the Western Seas?

Reasons for abolition:

1. The previous voyages to the Western Ocean were all free, which was a serious waste, leading to an empty state treasury.

The enemy began to invade the southeast coast.

3. The resurgence of Mongolian minorities such as Wala in the north poses a threat to the north and has no time to take care of it.

4, the emperor personal reasons

Reason for recovery:

1, continue the great cause

2, the emperor's personal reasons