What was the impact of senator gerald nye's investigative committee, which charged in 1934, but could not prove, that arms manufacturers had maneuvered the united states into fighting world war i?

Convinced the country that economic ties to warring countries eventually pulls you into war.--this study will direct US decision making going into World War II with neutrality acts preventing the sale of arms to warring countries. 

Nye's investigations, though not proven, made US citizens more skeptical of US involvement in world affairs. The economic powers needed to be watched and regulated at times of war to prevent economic reasons pulling the country into costly and deadly wars.