At the beginning of both World Wars, the United States initially adopted a policy of neutrality and non-interference. In both cases, the United States was hesitant to become involved in a European conflict and sought to maintain its neutrality as long as possible.
During World War II, the United States had several reasons for taking an isolationist and neutral stance. One major reason was the trauma and loss of life that the country had experienced during World War I. Many Americans were opposed to getting involved in another costly and bloody European war. Additionally, the United States was still recovering from the Great Depression and was focused on domestic issues. Finally, there were also significant political and ideological divisions within the country, with some people supporting the Allies and others supporting the Axis powers.