Sakoku literally translates as "closed country" and is the term traditionally used to describe Japan's foreign policy between the 1630s and the 1850s. Sakoku severely limited interactions between Japan and other countries.
The word sakoku was never used by the 17th-century shogunate officials who created the policies; it was introduced in 1801 by a Nagasaki interpreter, Shizuki Tadao, translating an essay by the German physician Engelbert Kaempfer. And while sakoku conjures the image of a hermit nation entirely cut off from the globe, this is a myth: the policy strictly managed and monopolized foreign contact to protect the political legitimacy and domestic security of the ruling Tokugawa regime.
Full article: Sakoku: How and Why Japan Closed Its Doors
Sakoku officially began between 1633, when the first edict restricting Japanese overseas travel was issued, and 1639, when the fifth and final edict completed the policy by banning Portuguese ships from Japan.
It ended after U.S. Commodore Matthew C. Perry's "black ships" arrived in 1853; the formal end is often pinpointed to 1854, when Japan began opening its borders to Western nations. The duration is usually calculated as 215 years (1639–1854), though some historians speak of roughly two and a half centuries, counting from the earliest trade restrictions.
| Year | Edict | Issued by | Core measures | Enforcement |
|---|---|---|---|---|
| 1587 | Bateren Tsuihōrei (precursor) | Toyotomi Hideyoshi | Christian priests banned from Japan | Weak |
| 1614 | Christian Expulsion Edict (precursor) | Tokugawa Ieyasu | Christianity banned; missionaries deported | Systematic and ruthless |
| 1633 | First sakoku edict | Tokugawa Iemitsu | Overseas travel restricted to licensed ships; returnees executed; rewards for informing on priests | Strict |
| 1634 | Second sakoku edict | Tokugawa Iemitsu | First edict reaffirmed; construction of Dejima begins | Strict |
| 1635 | Third sakoku edict | Tokugawa shogunate | Total travel ban; red-seal ships revoked; foreign trade confined to Nagasaki | Absolute |
| 1636 | Fourth sakoku edict | Tokugawa shogunate | Eurasian children deported; samurai barred from dealing with foreigners | Absolute |
| 1639 | Fifth sakoku edict | Tokugawa shogunate | Portuguese ships banned from Japan for good | Draconian |
Banned Christian priests from Japan. Hideyoshi issued it immediately after his Kyushu Expedition, alarmed by the power of the Christian lords, forced conversions, the destruction of temples and shrines, and the Portuguese slave trade of Japanese people. Enforcement was weak — dependent on the Macau trade, Hideyoshi never deported the missionaries. Only the 1596 San Felipe incident drove him to violence: the crucifixion of the 26 Martyrs of Japan in 1597.
Full article: Hideyoshi's Edict: The Night Japan Turned Against the Church
Banned Christianity in Japan outright. Ieyasu had tolerated the faith for the sake of Iberian trade, letting the Christian population swell to roughly 300,000, but Protestant advisors such as William Adams warned of a missionary "fifth column," and the 1612 Okamoto Daihachi scandal convinced him Christians held subversive loyalties. Enforcement was systematic and ruthless: churches destroyed, over 300 missionaries and Japanese Christians exiled to Macau and Manila, believers executed, and the terauke temple-registration system imposed on all citizens.
Full article: The 1614 Expulsion Edict: The Monk, the Manifesto, and the End of Christian Japan
Forbade Japanese ships to travel overseas except licensed "Shogunate's decree ships" (hōshosen), on pain of death; Japanese living abroad were barred from returning under penalty of execution. It reinforced the ban on Christianity, offered rewards to informants who betrayed hidden priests (bateren), and pegged the national silk price to Nagasaki. Strictly enforced — returning Japanese were executed.
Reaffirmed the first edict, adding three prohibitions posted on notice boards throughout Nagasaki: no Christian priests, no vessels overseas, no Japanese armor to leave Japan. Construction began on Dejima, the artificial island in Nagasaki harbor built to segregate foreign merchants from the Japanese population.
Total prohibition of overseas travel: the red-seal ships were revoked, leaving abroad or returning home was punished by death, and all foreign trade was confined to Nagasaki. The trigger was the "Santos Affair" of 1634, when authorities discovered that red-seal ships were still funneling money from Macau to the underground church. Absolute enforcement — no more exceptions.
Deported the Eurasian children of the "Southern Barbarians" (Portuguese and Spaniards) along with any Japanese families who had adopted them; any attempt to return was punishable by death. Samurai were forbidden all commercial dealings with foreigners, and foreign ships had to depart by the 20th day of the ninth month. Absolute enforcement.
Banned the Portuguese from Japan for good, accusing them of smuggling missionaries and being behind the Shimabara Rebellion. Enforcement was draconian: any Portuguese ship returning would be burned and its crew beheaded. The Macau embassy of 1640 proved the point — 61 of its members were executed.
Full article on the edict cascade: Sakoku: How and Why Japan Closed Its Doors
The Portuguese were formally expelled from Japan in 1639, when the fifth sakoku edict banned their ships from Japanese waters. But the expulsion was the climax of half a century of escalating measures against missionaries and their converts:
Full timeline: A Complete Timeline of Portuguese-Japanese Exchange, 1543–1650
The Tokugawa shogunate closed Japan for four interlocking reasons: to eradicate Christianity, which it saw as the vanguard of European conquest; to strip the rival western daimyō of the wealth of foreign trade; to stop the drain of Japan's silver and copper; and to cut off the overseas Japanese who might return as rebels.
No. Modern historians argue that the term "closed country" is misleading — many now prefer kaikin ("maritime restrictions"), because Japan managed its foreign relations rather than abolishing them. The Tokugawa regime deliberately maintained four highly regulated "windows":
The decisive shock was the 1596 San Felipe incident, when a shipwrecked Spanish pilot reportedly boasted that missionaries were the advance guard of Spanish conquest — Hideyoshi, enraged, ordered the crucifixion of 26 Christians in Nagasaki. But suspicion had been building for a decade, fed by:
Sealed against the outside world, Tokugawa Japan experienced over two centuries of internal peace, rapid urbanization, and a flowering merchant culture — Edo grew into the largest city on earth — even as the samurai decayed into a salaried bureaucracy and recurring famines strained the regime. The companion article Behind Closed Doors: How Japan Reinvented Itself in Isolation tells this story in full.
Full article: Behind Closed Doors: How Japan Reinvented Itself in Isolation
The forced opening destroyed the shogunate within fifteen years. The humiliating treaties triggered a xenophobic backlash, civil war, and the Meiji Restoration of 1868 — after which Japan dismantled the samurai class and rebuilt itself into a modern industrial power.
The slogan Sonnō Jōi ("Revere the Emperor, Repel the Barbarians") drove a campaign of assassination, but Western bombardments of Satsuma (1863) and Chōshū (1864) taught the militant domains that expulsion was impossible. Allied from 1866, they forced the last shogun, Tokugawa Yoshinobu, to resign in 1867 — ending 268 years of Tokugawa rule — and restored the Emperor Meiji in 1868. The new government abolished the feudal domains (1871), introduced conscription (1872), and crushed the last samurai revolt, the Satsuma Rebellion (1877). With the Meiji Constitution of 1889, industrialization, and victories over China (1894–1895) and Russia (1904–1905), Japan re-entered the world as a modern power.
In July 1853, U.S. Commodore Matthew C. Perry sailed a squadron of steam-powered "Black Ships" into Edo Bay, demanding that Japan open its ports. When he returned in February 1854 with nine warships, the shogunate — its coastal defenses hopeless — signed the Treaty of Kanagawa (March 1854), opening Shimoda and Hakodate.
Similar treaties with Great Britain, Russia, France, and the Netherlands followed. Full economic opening came in 1858, when the first U.S. consul, Townsend Harris, negotiated a commercial treaty that opened further ports to free trade and granted foreigners extraterritorial rights.
Japan reopened because it could no longer defend its isolation: Britain's crushing of Qing China in the First Opium War, Perry's steam-powered warships, and famine and rebellion at home convinced the shogunate that the alternative to negotiation was conquest.