Answer: Tokugawa´s seclusion edicts issued in the 1600s aimed to interrupt the rapid expansion of Christianity in Japan. Catholic converts were increasing in number, challenging Buddhism precepts and also acquiring political and economical power in important port cities as Nagasaki. Two edicts closed the borders for foreigners and prevented Japanese people from leaving the country.
By restricting the daimyōs' ability to trade with foreign ships coming to Japan or pursue trade opportunities overseas, the Tokugawa bakufu could ensure none would become powerful enough to challenge the bakufu's supremacy.
