The "Attack on Pearl Harbor" or the "Battle of Pearl Harbor" was a surprise military strike at Pearl Harbor, Hawaii in December of 1941, by the Imperial Japanese Navy Air Service against the United States naval base. This marked the entry of the U.S. into World War II.
The actions taken by The United States of America were:
Declaring war the next day
The actions taken by Japan were:
Destroying eight battleships
Using Kamikaze pilots
Launching attack during peace negotiations