Japan installed an isolationist foreign policy in the late 17th century that would last more than 200 years. Why?

After Portuguese missionaries converted hundreds of thousands to Christianity in Japan, the nation cracked down, isolating themselves in the 17th century in the hopes to prevent other religions and cultures from contaminating their own. Known as "sakoku," the isolationist policy forbade the Japanese from leaving and foreigners from entering, upon pain of death.

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