Question

How did the United States mobilize prior to joining World War II?
by boosting wartime production for the Allies
by planning to drop atomic bombs on Japan
by boosting wartime production for the Axis powers
by joining the peace movement

Answer 1

by boosting wartime production for the Allies

Before officially entering WWII, the U.S. increased military production and aid to Allied nations (e.g., Cash-and-Carry, Lend-Lease), expanded military training and the draft, and converted industry into war materiel — the “arsenal of democracy.”