That would be Commodore Perry.
No
The United States.
Admiral Matthew C. Perry is known for opening Japan to trade with the United States. This opening took at least two trips to Japan. In addition, credit must be given to US President Millard Fillmore who authorized Perry's expedition.
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matthew c parryKeykocky
In 1853, the U.S. government demanded that Japan (then a closed country) reopen trade with the West. In 1854, the U.S. government (through gunboat diplomacy) forced the Japanese government to sign a treaty, opening Japan up to trade with the U.S.
Japan at the time of its opening had no imperialist ambitions. The purpose of opening japan was to use its ports as coaling stations, prevent the maltreatment of us/european sailors shipwrecked there and eventually develop it as a market. It was initially a victim of the imperialist designs of other nations (though this changed over time).
Admiral Perry forced Japan into world trade at "cannon point", in the 19th century.
The seclusion of Japan began to end with the arrival of Commodore Perry in 1853. The Harris Treaty (Treaty of Amity and Commerce) in 1858, was the culmination of Perry's arrival. This resulted in the opening of Japan to international trade.