This archive reproduces microfilm of the U.S. Department of State Decimal Files 611.94 and 6194.11. The documents trace the commercial relations between the United States and Japan over the course of almost half a century in the years 1910-1929, 1930-1939, 1940-1944, and 1945-1949. The files are predominantly instructions to -- and dispatches from -- diplomatic and consular officials. Notes between the Department of State and foreign diplomats in the United States; memoranda prepared by State Department officials; and correspondence with officials of other government departments, private businesses, and persons are also featured. Subjects include: advertising, aircraft, commerce, customs administration, drug regulations, duties, embargo, free ports, landing certificates, law, markets, merchandise, prison made goods, pure food and drug regulations, smuggling, tariff treaties, export and import trade, undervaluation of imported merchandise, among many other topics.