Cheesicle, Pearl Harbour was a 100% provoked attack.
USA moved all its troops right at the border of Japanese territory in the pacific, which almost forced them to attack somehow.
And what they did on Pearl Harbour was just ASKING for a huge attack. Who would just leave all its defences locked somewhere without having the key for it and station half a dozen soldiers on it when the whole damn world is at war?
Pearl Harbour was, after all, the reason the USA joined World War II, it wasn't that much of a surprise for them.