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  Beggining of the Tokugawa Dynasty, where Tokugawa Ieyasu came into power
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  In the 1630's, there was a restriction on foreign trade.
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  A Portuguese merchant ship ignored these rules, and most of the crew was beheadded.
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  After 1720, Tokugawa authorities listed the ban on foreign literature, which lead to more Dutch influence of Japanese learning.
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  End of the Tokugawa dynasty