The US adopted isolationism to avoid involvement in conflicts, displaying willingness to assist allies if necessary.
Isolationism was adopted by the US before World War II for various reasons, including a desire to avoid getting involved in the escalating conflicts in Europe and Asia during the late 1930s. The policy of neutrality was evident through Congress passing bills imposing neutrality in foreign conflicts and the refusal to join the League of Nations.
Despite this, President Roosevelt's private communications revealed a growing willingness to assist Britain and France if war broke out with Germany, indicating a subtle shift from strict neutrality towards potential support of allied nations.
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