Portuguese merchants introduced tobacco, cotton and refmed sugar to Japan. The Japanese dish tempura, which is a seafood or vegetable dish fried in batter, is often incorrectly believed to have been invented by the Japanese. It was actually introduced to Japan by the Portuguese.
The Tokugawa shoguns viewed these converts as a threat to their authority, and in 1639, the Tokugawa bakufu passed several laws restricting all foreigners from entering Japan, except for the Dutch.
This long period of national isolation was called sakoku. During sakoku no Japanese
could leave the country on penalty of death, and very few foreign nationals were permitted
to enter and trade with Japan. Sakoku literally meant “chained country.”
Japan's isolation policy was fully implemented by Tokugawa Iemitsu, the grandson of Ievasu and shogun from 1623 to 1641. He issued edicts that essentially closed Japan to all foreigners and prevented Japanese from leaving.
The world started challenge Japan’s isolation restrictions against foreign trade.
On the July 8th 1853, four black ships commanded by Matthew Perry arrived at Edo bay. It carried around 1000 men and 61 guns.
The Japanese were closed off for so long that they thought the ships were “giant dragons puffing smoke”.