Answer:
United States
Explanation:
According to my research on the Japan trade routes, I can say that based on the information provided within the question it was the United States gunboats that sailed into Tokyo. These boats were led by Commodore Matthew Calbraith Perry of the US Navy, and was the man in charge of the Convention of Kanagawa in 1854 which opened these trade routes between the US and Japan.
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Matthew Calbraith Perry was a Commodore of the United States Navy who commanded ships in several wars
