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.