What was the closed country policy in japan

Sakoku (鎖国, "closed country") was the isolationist foreign policy of the Japanese Tokugawa shogunate (aka Bakufu) under which relations and trade between Japan and other countries were severely limited, nearly all foreign nationals were barred from entering Japan

Explanation:

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this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.