The policy, enacted prior to direct American involvement in World War II, represented a pivotal shift in United States foreign policy. It authorized the president to provide war materials to allied nations whose defense was deemed vital to the security of the U.S. This aid, encompassing items ranging from food and vehicles to weaponry, was provided on credit or deferred payment terms, effectively circumventing existing neutrality laws that prohibited arms sales to belligerent nations.
This initiative proved crucial in bolstering the war efforts of countries like Great Britain, the Soviet Union, and China, enabling them to resist Axis aggression during a critical period. It signified a move away from strict isolationism and towards a more interventionist role on the global stage. By supplying essential resources, it significantly contributed to the Allied victory and laid the groundwork for the post-war international order.