Why did China stop investing in overseas naval expeditions?

China stopped investing in overseas naval expeditions in the early 15th century primarily due to a shift in political priorities and resources under the Ming Dynasty. The new leadership, particularly under Emperor Yongle's successor, focused on consolidating power, defending the homeland, and addressing internal issues rather than expanding maritime exploration. Additionally, there were concerns about the costs of such expeditions and the belief that resources would be better allocated to agriculture and infrastructure. This inward focus ultimately led to the cessation of large-scale naval voyages like those led by Admiral Zheng He.