In 1934, Congress passed the Reciprocal Trade Agreements Act, which stipulated that the President must consult with the Secretary of Agriculture when negotiating tariff reductions for agricultural commodities. Secretary of Agriculture Henry A. Wallace delegated this responsibility to the Foreign Agricultural Service Division, and thus began the FAS's role in formulation and implementation of international trade policy. The FAS led agricultural tariff negotiations, first concluding a new tariff agreement with Cuba, followed by Belgium, Haiti, Sweden, Brazil and Colombia. By 1939, new agricultural tariffs were in place with 20 countries, including the United Kingdom, the United States' largest agricultural trading partner.