U. s. foreign policy shifted away from a to international involvement.

Isolationist

Explanation:

While Europe plunged into total war, during the late 1930's, the US cabinet stayed neutral. Roosevelt being president still wanted America to stay out of the conflict as World War unfold, as an official policy for US foreign policy:

This led society to split into the non interventionists (isolationists) and interventionists, but with Pearl Harbor's attack this changed the odds and end the long history of avoiding wars among the popular view.

Finally the declaration of war was made to the Axis after Japan's attack.

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