Answer:
He decried the gold standard, concluding the speech, "you shall not crucify mankind upon a cross of gold". Bryan's address helped catapult him to the Democratic Party's presidential nomination; it is considered one of the greatest political speeches in American history.
Explanation:
Because I am not exactly sure what war you are talking about, I will answer the question as if it were World War II. The Attack on Pearl Harbor is the main reason the U.S. joined the war (WWII).
I hope this helps.