Final answer:
In 1854, Commodore Perry signed the Treaty of Kanagawa, which opened Japan to American trade, effectively ending Japan's period of seclusion and ushering in a new era of international relations for the country.
Step-by-step explanation:
In 1854, Commodore Perry signed the Treaty of Kanagawa, which opened the market of Japan to American trade. This historical event marked the end of Japan's isolationist policies and signified the beginning of its interaction with the West. Perry arrived in Edo (Tokyo) Bay in 1853, displaying the strength of his fleet and coercing the Japanese to negotiate.
Through intimidation and diplomatic pressure, he was able to secure a treaty the following year that opened two Japanese ports to American ships, established a U.S. consulate, and ensured the welfare of shipwrecked American sailors. This crucial moment paved the way for the later Treaty of Amity and Commerce, further deepening trade relations between the United States and Japan.