Why did japan enter a period of isolation ? explain clearly ! students ! : d

Japan entered a time of Isolation around the 1600s for 200 years aka Sakoku (which means sealed/closed or locked country in Japanese:D ). 

The reason for this goes back when Commodore Perry, who I think was an American came and interacted with them that resulted in the English, Spanish, and Portuguese coming to trade with them. At first, the Japanese were glad because they received a lot of new tech things that they did not have before such as clocks and much more. But then missionaries started pouring in and at first, the Japanese were fine with it but when a lot of Japanese people started converting to Christianity, the Daimyo of Japan at that time say a threat to his power and the unity of the people so he made a decision to kick out all westerners and close the borders. This resulted in the 200 years of isolation but they were not completely isolated because they kept one shipping port open and that was ONLY to trade with the Portuguese, Chinese, and Koreans. 

This is pretty much the basic details of what I can tell you but I hope that you learned something from this:)