The Defeat of the Axis Powers After the defeat of the Axis Powers in World War II, the United States emerged as the worlds most powerful industrial military nation. Important figures such as Teddy Roosevelt, Winston Churchill, and Joseph Stalin had all made the most important decisions which in turn has provided the United States more power. Due to the demands of the war, the Great Depression had finally ended. This powerful victory has changed the position of United States in international affairs. On December 11, 1941, Hitler declared war on the United States. In the textbook it was not fully explained why Hitler declared war on United States, but it was