The treaty opened the Japanese ports of Shimoda and Hakodate to United States trade and guaranteed the safety of shipwrecked U.S. sailors; however, the treaty did not create a basis for establishing a permanent residence in these locations. The treaty did establish a foundation for the Americans to maintain a permanent consul in Shimoda. The arrival of the fleet would trigger the end of Japan's 200 year policy of seclusion (Sakoku). The Treaty was ratified on 21 February 1855.
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