Tokugawa Japan Closes Its Doors

1600–1639 CE — East Asia, Tokugawa Japan

Today: Japan (capital Edo, modern Tokyo)

After a century of civil war, the victor at Sekigahara founded the Tokugawa shogunate and then did something remarkable: he and his heirs largely sealed Japan off from the outside world, expelling missionaries, banning most foreign trade, and forbidding Japanese from leaving on pain of death. The result was over 250 years of peace, a flowering of distinctly Japanese culture — and a country that fell technologically behind the West it had shut out. It is a rare case of a state choosing stability over dynamism, and getting exactly what it chose.

Worth knowing: Tokugawa Japan was so peaceful for so long that samurai — a warrior class with no wars — gradually became bureaucrats and poets, and gunsmithing, which Japan had mastered early, quietly withered until Western warships arrived 250 years later.

Pattern: Institutional sclerosis — Rules and bodies outlive their function; rent-seeking and complexity rise while returns on added complexity fall.

Entry 162 of 240 in Precedent, a walk through the whole human story in order.