How and why did Ming China isolate themselves in the late 15th century?

After a period of maritime explorations (see Zheng He) in the early 15th century, the Ming Dynasty started shutting the Middle Kingdom out of the rest of the world. This of course continued with the Qing, and the empire remained largely isolated until the 19th century, because of foreign "initiative."

Explanation:

judicial because its legislative, executive and judicial