Answer:
Sakoku (??, "closed country") was the isolationist foreign policy of the Japanese Tokugawa shogunate (aka Bakufu) under which, for a period of over 220 years, relations and trade between Japan and other countries were severely limited, nearly all foreign nationals were barred from entering Japan and common Japanese. From 1633 until 1853, the military governments of Japan enforced a policy of sakoku or 'closed country' which prevented foreigners from entering Japan on penalty of death, and prohibited Japanese citizens from leaving.
Because it shows what happened in the past and why things are how they are today.
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It is different: The Bantu peoples developed distinctive cultures yet maintained a similar language.</span>