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How did Tokugawa Ieyasu’s rule begin the Tokugawa period?

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Statue of Tokugawa Ieyasu in ornate robes holding a bow, with arrows on his back, at the Tosho-gu shrine in Nikko, Japan. — Tokugawa Ieyasu Statue of Tokugawa Ieyasu at the Tōshō Shrine in Nikkō, Japan.

Tokugawa Ieyasu’s rule, which initiated the Tokugawa period (1603–1867), began following his decisive victory at the Battle of Sekigahara in 1600. By defeating the coalition of Toyotomi loyalists, Ieyasu gained military hegemony over Japan’s daimyo and effectively ended the prolonged chaos of the Sengoku period.123

In 1603, Emperor Go-Yōzei formally elevated Ieyasu to the rank of shogun, allowing him to establish the Edo shogunate in Edo (modern-day Tokyo). This government became the most powerful central authority in Japanese history, maintaining stability through several key strategies:13

Political Control: Ieyasu and his successors balanced the power of potentially hostile domains with strategically placed allies and collateral houses.4
Systematic Regulation: The shogunate enforced a strict social hierarchy and later implemented the sankin-kōtai system, requiring daimyo to reside in Edo periodically.24
Isolationism: To ensure political stability and prevent foreign interference, the shogunate adopted sakoku, an isolationist policy that banned Christianity and strictly limited foreign contact.24

These measures fostered over two centuries of internal peace and economic growth.4