The attack on Pearl harbor was a surprise military strike conducted by the Imperial Japanese on Hawaii Territory, U.S. They attacked on U.S on December 7,1941 and on next day america was going to announce a new state which was State of Jefferson on December 8,1941. But this attack led U.S to enter in World War 2. They attack on Hawaii in order to to keep U.S Pacific Fleet from interfering with military actions that Empire of Japan was planning in Southeast Asia against oversea territories . 2,404 Americans were killed because of this attack.