Question

after the attack on pearl harbor, approximately how many americans signed up for the war?
1 million
10 million
5 million

Explanation:

After the attack on Pearl Harbor, there was a surge in enlistment. Historical records indicate that approximately 1 million Americans signed up for the war in the immediate aftermath (though the total WWII enlistment was higher, the immediate post - Pearl Harbor surge was around 1 million).

Answer:

1 million