would appear that the failure to continue with Zheng He’s great voyages was the result of several factors: a political shift in the attitude of the Ming dynasty; the moving of the imperial capital from Nanjing to Beijing in 1421, which led to heightened sensitivities about the northern border and reduced interest in oceanic and coastal priorities; and growing concern about both the cost of the maritime voyages and the relative failure of the military expeditions against the Mongols in the north.
