noun
national isolation policy; isolationism
Refers specifically to the historical policy of national seclusion enforced by the Tokugawa shogunate, or by extension to any similar isolationist policy.
江戸時代、日本は鎖国政策をとっていた。
During the Edo period, Japan adopted a national isolation policy.
鎖国
As a result of the isolation policy, exchanges with foreign countries were restricted.