was the foreign relations policy of Japan under which no foreigner could enter nor could any Japanese leave the country on penalty of death. The policy was enacted by the Tokugawa shogunate under Tokugawa Iemitsu through a number of edicts and policies from 1633–39 and remained in effect until 1853 with the arrival of the Black Ships of Commodore Matthew Perry and the forcible opening of Japan to Western trade. It was still illegal to leave Japan until the Meiji Restoration (1868). It was preceded by an era commonly referred to as Sengoku, or the Warring States period of Japanese history.