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.