An agreement signed in 1854 between Japan and the United States which ended Japan's policy of isolationism and opened up ports for American trade.
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Isolationism : A policy or doctrine aimed at minimizing relations with other countries to focus on domestic issues.
Commodore Matthew Perry : A U.S. naval officer who played a key role in opening Japan to trade with America in 1854 through his 'gunboat diplomacy'.
Gunboat Diplomacy : The pursuit of foreign policy objectives with conspicuous displays of naval power implying or constituting a direct threat of warfare, should terms not be agreeable to the superior force.