Which event led to the United States stigmatizing isolationism and encouraging international involvement?

The choice of World War II as the event that led to the United States stigmatizing isolationism and encouraging international involvement is grounded in the significant shift in U.S. foreign policy that occurred during and after the war. Prior to World War II, the United States adopted a more isolationist stance, particularly during the interwar years following World War I, as many Americans believed that involvement in foreign conflicts did not serve national interests.

However, the attack on Pearl Harbor in 1941 marked a turning point, propelling the nation into World War II. This conflict not only reshaped perceptions of isolationism but also highlighted the interconnectedness of global affairs. The war effort required extensive international cooperation, leading to an understanding that global stability was crucial for national security.

Post-war, the United States emerged as a superpower with a vested interest in preventing future conflicts. This prompted the establishment of international institutions such as the United Nations and NATO, reflecting a commitment to collective security and international engagement. The lessons learned from the devastation of the war ingrained in the American psyche the importance of being proactive in global politics to prevent isolationist tendencies that had previously contributed to instability.

In contrast, while World War I and the Great Depression significantly influenced U.S. policy