Attack on Pearl Harbor
Over the next several months, things progressed as planned. However,  Emperor Hirohito did not approve the attack plan until November 5. This is because he wanted to discuss the matter over a set of Imperial Conferences. Final approval was not given until December 1st. This was because a majority of Japanese leaders warned the emperor about the "Hull Note. They said it would, "destroy the fruits of the China incident, endanger Manchukuo and undermine Japanese control of Korea".