Final answer:
The United States followed a policy of isolationism during the 1930s, which involved limited political and military involvement in international conflicts. This policy was followed to avoid entanglement in the complicated politics of Europe and Asia during the pre-World War II era. The policy ended after the bombing of Pearl Harbor.
Step-by-step explanation:
During the 1930s, the United States pursued a foreign policy of isolationism. This means that the nation was primarily focused on its own internal affairs, with limited political and military involvement in foreign conflicts. The idea was to avoid entanglement in the volatile political dynamics of Europe and Asia in the pre-world War II era. For example, the United States remained relatively uninvolved during the early stages of World War II. It wasn't until the bombing of Pearl Harbor that the United States decided to abandon its isolationist policy and join the war.
Learn more about Isolationism