What was the official war policy of the us from 1939-1941?

From the beginning of World War II on September 1, 1939 until Pearl Harbor was attacked on December 7, 1941, the United States were officialy neutral.

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Between 1939 - 1941 the official War Policy of the U.S was "Neutrality"

Explanation:

Because the U.S was still feeling the the effects of World War I (1914 -1918) and they were not willing to engage in another conflict so soon. Although many Americans stuck with the isolationist view, President Franklin Roosevelt worked in the shadows to send aide to allies and to prepare Americans for a conflict that he regarded as inevitable.

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congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.