By 1615 , after its destruction , the tower keep era had reached its peak .
Construction declined with the establishment of the Pax Tokugawa , which lasted until the Meiji period in the late 19th century .
By 1615 , after its destruction , the tower keep era had reached its peak and construction declined with the establishment of the Pax Tokugawa , which lasted until the Meiji period in the late 19th century .