Answered

At what point did the United States become involved in World War II?

Awhen Germany invaded Poland
Bafter the Japanese Americans were placed in internment camps
Cafter Japan attacked Pearl Harbor
Dbefore Archduke Ferdinand was assassinated

Verified Answer :

The United States became involved in World War II only "c. after Japan attacked Pearl Harbor," since this represented an unquestionable act of war against the US that needed to be avenged. 

After Japan attacked Pearl Harbor, the United States became involved in World War ll. 

Answer: c. after Japan attacked Pearl Harbor

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