Why did the US adopt a policy of isolationism?

The U.S. adopted a policy of isolationism primarily after World War I due to widespread war fatigue, disillusionment with international involvement, and a desire to focus on domestic issues. The trauma of the war and the belief that foreign entanglements could lead to further conflicts fostered a sentiment among many Americans to avoid alliances and military commitments. Additionally, the Great Depression in the 1930s shifted priorities toward economic recovery, reinforcing the preference for isolation over international engagement.