Some things that Japan borrowed from China was the tea seed which was brought into Japan as a medicine but then was developed as a drink. Also the chrysanthemum (flower) came from China but was then used as a symbol of fall in Japan.
A Samurai were the military nobility and officer caste of medieval and early-modern Japan. It was a very powerful military.
Isolationism is a policy where you have to remain apart from interests or affairs of other groups mainly the political affairs of other countries.
Japan went into isolationism (isolation) because of homogeneous society, increasingly dangerous European threats, and because Japan wanted to keep the Japanese worldview and lifestyle uncontaminated by the western ways.
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