sentences:  The committee, which included economists Warren S. Hunsberger and Simon N. Whitney, were invited by the Japanese Economic Federation and the New York investment firm of Eastman Dillon and Company to research ways to improve trade relations between Japan and the U.S. so that Japan might become a U.S. ally.While in Japan, O'Ryan learned that the Japanese government planned to sign the Tripartite Pact with Fascist Italy and Nazi Germany.O'Ryan and his group submitted their report to the Japanese Economic Federation and returned home.