Commercial & Trade Relations Between Tsarist Russia, the Soviet Union & the U.S., 1910-1963 This link opens in a new windowFrom the U.S. State Department Central Classified Files, these materials relate to commercial and trade relations beginning in the Tsarist Russia period and extending through Khrushchev period. Materials from U.S. diplomats including treaties, general conditions affecting trade, imports and exports, laws and regulations, customs administration, tariffs, and ports of entry activities. Coverage from 1910-1963.