On December 7, 1941 at 7:53 A.M., a Japanese air squadron attacked the American fleet anchored in the waters of Pearl Harbour. The United States and its defensive strategy were struck right at the core. The attack was a major turning point. The very next day, the U.S. officially entered the war, ending their policy of isolationism and taking the conflict to a whole new and truly global level. How did Pearl Harbor change the face of WWII and, in turn, that of the world?