 Complete the following phrase:  Although the amendment to the Tripartite Pact was not yet in force, Hitler chose to declare war on the United States and ordered the Reichstag, along with Italy, to do so on 11 December 1941, three days after the United States declaration of war on the Empire of Japan. Roosevelts shoot on sight order had effectively declared naval war on Germany and Italy in September 1941, and Germany had learned of Rainbow Five in early December. Hitler could no longer ignore the amount of economic and military aid the US was giving Britain and the USSR. Hitlers hopes that, despite the previous rejections, Japan would reciprocally attack the Soviet Union, were not realized, as Japan stuck to its Nanshin strategy of going south, not north, and would continue to maintain an uneasy peace with the Soviet Union. Nevertheless, Germanys declaration of war further solidified GermanJapanese relations and showed Germanys solidarity with Japan, which was now encouraged to cooperate against the British. To some degree, Japans actions in South-East Asia and the Pacific in the months after Pearl Harbor, including the sinking of HMS Prince of Wales and HMS Repulse, the 