What was the reason for Japans isolation?

why did Japan want to be isolated from the rest of the world? even though they werent completely isolated, why didnt they want to trade with the outside world?What was the reason for Japans isolation?
The rulers of Japan, especially Ieyasu Tokugawa, recognized the dangers of European intervention. They learned fairly quickly what was happening to other cultures and realized the danger to Japan. And while the Japanese quite readily took in modern technology(in the form of muskets), once a stable government was formed, there was no need for such things. So the Tokugawa dynasty set a policy of isolationism in order to avoid social upheavals. This is the same reason that christianity was officially suppressed, and the religion was often used as a way of infiltrating a culture and gaining control over it.


With the Perry expedition, the Japanese rulers realized that they could no longer afford an isolationist policy if they wished to remain in power. So the upheavals they feared did come, but were still at least on their, the Japanese terms, rather than the terms of the encroaching Americans and Europeans.What was the reason for Japans isolation?
They were afraid that the foreign influences would dilute their culture and more importantly that the ruling class would loose its power.