Sakoku Edict: Isolating Japan

In 1635, Shogun Tokugawa Iemitsu issued a series of directives that became central to what is later known as Japan’s sakoku, or “closed country,” policy. These edicts were part of a broader set of measures enacted between 1633 and 1639 during the early Edo period. The 1635 decree specifically imposed strict controls on foreign relations, including prohibiting Japanese subjects from traveling abroad and banning those already overseas from returning to Japan. It also regulated trade and limited contact with foreign nations to designated ports under close supervision. The policies were introduced in response to concerns about foreign influence, particularly the spread of Christianity through European missionaries, which the shogunate viewed as a potential threat to political stability and social order. By restricting foreign access and controlling trade, the Tokugawa government aimed to consolidate authority and reduce the risk of external interference. Enforcement of these measures was strengthened in subsequent years, including the expulsion of most Europeans and tighter regulation of foreign merchants. Under this system, limited international trade continued through carefully controlled channels, most notably with Dutch and Chinese merchants at Nagasaki. Korea and the Ryukyu Kingdom also maintained regulated diplomatic and trade relations. The sakoku framework remained in place for over two centuries, shaping Japan’s foreign policy until the mid-19th century, when external pressures led to its gradual dismantling.