HURRRYYY Which event led to the peak of 3,030,407 enlistments for US military service in 1942?
O the Blitzkrieg of London by German air forces
O the declaraton of war by the Soviet Union on Germany
O the attack on the Pearl Harbor naval base by Japan
the discovery of concentration camps in Poland

The attack on the Pearl Harbor Naval Base by Japan.

Explanation:

After Japan launched their offence on Pearl Harbor, the United States became involved in the war. Before this, we were neutral and didn't want to be involved in the conflict. It was an act of pride by the young men who had enlisted.

mint more silver currency sorry its probably to late.

you didn't post an image.