The Japan initially wanted the Americans expelled from their however, Perry, the American head of the troop was very persistent that after several negotiations, the Japan was made to sign the "Treaty of Kanagawa" on March 31, 1854. The treaty guaranteed that the Japanese will be the one to repair shipwrecked Americans that provides food, coal, water and other needs of the ships that docked in Nagasaki. This forced labor had affected the economy of Japan greatly. It heightened the inflation brought by the foreign money entering Japan disrupting Japan's currency.