The Crossroads of the Aether
In 1424, the Yongle Emperor died. His successor, the Hongxi Emperor (reigned 1424–1425), decided to curb the influence at court. Zheng He made one more voyage under the Xuande Emperor (reigned 1426–1435), but after that Chinese treasure ship fleets ended. Zheng He died during the treasure fleet’s last voyage.
…Chinese merchants continued to trade in Japan and southeast Asia, but Imperial officials gave up any plans to maintain a Chinese presence in the Indian Ocean and even destroyed most of the nautical charts that Zheng He had carefully prepared. The decommissioned treasure ships sat in harbors until they rotted away, and Chinese craftsmen forgot the technology of building such large vessels. (Source)