Pearl Harbor was on December 7th 1941
This was a surprise attack by the Japanese effort at Pearl Harbor, Hawaii. This would drive the US out of isolation, making them join the war.
This also led to the bombings of Hiroshima and Nagasaki
A. Micheal is actually incorrect he is thinking about world war 1, the united states didnt even join the league of nations even though it was our idea. The answer is A. "Over there" was a patriotic song about sending our soldiers "over there" meaning germany to defeat the "huns" which was a derogatory name for german soldiers because the the "huns" they had a spike on their helmet like the "huns" did.
They are Developing nations