How did the American public react to the formation of the United Nations?. . by opposing U.S. membership on the grounds that it would cost the nation too much money. . by supporting U.S. membership more strongly than it had in the case of the League of Nations. . by turning against President Truman for failing to secure a U.S. veto over important U.N. decisions. . by worrying that the organization would become an instrument of communist expansion into the Western Hemisphere.