…."In response to these and other such charges, the U.S. Senate voted to establish the Special Committee Investigating the Munitions Industry in 1934. This body, headed by Senator Gerald P. Nye of North Dakota, was empowered to pursue allegations that American and European weapons producers had conspired to instigate World War I and other conflicts in order to stimulate the demand for weapons. The Nye Committee (as it was called) was also authorized to investigate other charges of wrongdoing by the international arms industry.
After conducting numerous hearings, the Nye Committee concluded that U.S. arms firms had, in fact, employed bribery to clinch overseas sales and had spread tales of imminent hostilities in order to play one prospective buyer off another; it did not, however, find that they had conspired to ignite World War I. In the end, the Senate investigation did not result in any legal action against American arms companies. It did, however, lead to the establishment of the U.S. Munitions Control Board, the first governmental agency charged with regulating the arms traffic. It also sustained the national mood of isolationism and helped ensure passage of the Neutrality Act of 1935, which compelled the president to impose an arms embargo on nations at war."….
https://www.americanforeignrelations.com/A-D/Arms-Transfers-and-Trade-The-interwar-period-and-world-war-ii.html