1: The attack on Pearl Harbor was a turning point because it caused the United States to get involved in WW2 with Japan. Hitler also had declared war on the United States even though it was absolutely unnecessary to do so.
2: The answer is "The United States shutting off the oil supply to Japan." This is because Japan wanted oil, rubber, and other resoures in South Asia but the area was heavily guarded by the American Navy.
4: The attack happened on December 7, 1941 and Roosevelt had no choice but to declare war the day after the attack
