 Complete the following phrase:  After the Japanese attack on Pearl Harbor on 7 December 1941, followed by Nazi Germanys declaration of war on the United States four days later, and the United States declaration of war on Germany in response, Hitler authorized a mission to sabotage the American war effort and attack civilian targets to demoralize the American civilian population inside the United States. The mission was headed by Admiral Wilhelm Canaris, chief of the German Abwehr. Canaris recalled that during World War I, he organized the sabotage of French installations in Morocco, and that other German agents entered the United States to plant bombs in New York arms factories, including the 