1. between world war i and world war ii, americans believed that the united states should follow a foreign policy that emphasized a) containment and interventionism b) internationalism and free trade c) neutrality and isolation d) collective security and defensive alliances 2. in 1945, 50 nations established an organization of nations discuss problems and avoid war. a) league of nations. b) warsaw pact c) bretton woods agreement. d) united nations. 3. what was a key challenge faced by the united states during world war ii? a) fighting the war on several fronts b) lack of public support for the war effort c) total reliance on naval power d) difficulty gaining congressional support