The Cuban Missile Crisis has become one of the critical points in the history of the Cold War. With Soviet nuclear warheads already positioned to strike the America, the world feared that it could be the brink of a third world war. Both superpowers thought house close could be thus, communications between Washington and Moscow were increased.
Representatives and also the bill sent to the Senate. The Senate could refer the text of the bill to a Senate committee for inquiry (this will happen whereas the bill is within the House). A Senate Committee reviews the bill before it return to the Senate floor for a vote.
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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.