which of the following events most directly lead to American military involvement in world war 2?

Question

A: the Japanese attack on pearl Harbor.
B: the bombing of London
C: the soviet Union entering the war.
D: Germany's invasion of Poland

Answer 1

This site has your answer.

http://www.nationalww2museum.org/learn/education/for-students/ww2-history/america-goes-to-war.html?referrer=https://www.google.com/

Answer 2

ok let me see

Answer 3

so its A

Answer 4

Yes. President Roosevelt called it "the day that shall live in infamy."