That really depends upon which "us" you are referring to.
Pearl Harbor
Both ships were the catalyst that brought the US into war. The sinking of the USS Maine brought us into the Spanish American War. And the Lusitania brought us into World War 1.
I really don't know
The Japanese
Franklin Delano Roosevelt and World War II brought us out of the Great Depression.
PEARL HARBOR
David Cameron
it was brought out by world war II, but most people want to think the war just made the depression worse.
Mexico
I really don't know
Mexico
Mainly, it was World War II.