The arrival of warships from what nation forced Japan to give up its policy seclusion?

The arrival of warships from the United States forced Japan to give up its policy of seclusion. Commodore Matthew Perry arrived in Japan in 1853 with four warships and demanded that Japan open its ports to American trade. The Japanese were impressed by the power of the American ships and realized that they could not resist. They agreed to sign the Treaty of Kanagawa in 1854, which opened the ports of Shimoda and Hakodate to American ships. This treaty marked the end of Japan's policy of seclusion and the beginning of its modernization.