The United States has officially joined the war after a surprise attack on Pearl Harbor early Sunday morning. This plan, known as Operation Z, was created by Isoroku Yamamoto, a Japanese Marshal Admiral. Just before 8:00a.m. on December 7, a fleet of Japanese war planes approached the Hawaiian island of Oahu and bombed the U.S. naval base, Pearl Harbor. A total of over three hundred Japanese fighter and bomber planes were sent in two waves to carry out the attack. Radars located at Pearl Harbor picked up a signal of planes coming towards the base, however it was not pursued further because the planes were believed to be ones that were scheduled to arrive that morning. It lasted for nearly two hours and left the nation devastated.
