The strongest period of isolation was during Edo Period. The sakoku policy, or locked country in english, lasted from the establishment of the Tokugawa Bafuku in 1603 until the arrival of Commodore Perry in 1853. Commodore Perry and the United States Navy forced Japan to open up it's ports. Sakoku policy was very strict. Foreigners were completely barred from entering the country and any Japanese who left Japan were executed if they returned.
thats right but you might be looking for this answer.........Japan had a particularly strong isolationist period from1641 to 1553 Japanese citizens were not allowed to leave the country. If they did leave Japan, they were forbidden to return. The penalty for returning was death. No Europeans were allowed to trade with Japan, except the Dutch. They were confined to the tiny island of Deshima in Nagasaki's harbor.
Matthew Perry ended Japan's Isolation when the US sent him to Japan.
The mountains of Japan and the location of Japan helped lead to some isolation.
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isolation
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"Japan used Geographic isolation more than once" Is a sentence using Geographic isolation.
Ieyasu Tokugawa
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When Japan opened some if its ports to foreign trade their long history of isolation ended. So basically, their isolation (or Japanese isolationism) is what ended.
Japan ended its policy of isolation with the Meiji Restoration in 1868, marking a period of increased engagement with the outside world.
In 1868 an American fleet sailed to Japan and forced them to end there isolation.