What were the causes and effects of Pearl Harbor?

Short answer
is: Cause= America had placed an embargo on Japan due to their increasing power and taking over
most of the South Pacific islands. Japan was wanting to increase its oil for its war effort and
saw the Pacific Fleet of the United States as its biggest threat.

                        Effect= You've always heard that the bombing of Pearl Harbor
awoke a sleeping giant, and that it did. The United States was to remain neutral during the
second war in Europe and the bombing made declaring war a popular
reaction.