Final answer:
In World War II, the United States allied with the United Kingdom, the Soviet Union, and other Allied forces to defeat the Axis powers, despite having different postwar visions. After entering the war due to actions by Axis members, the US found itself on the side of the Soviets who had substantially weakened Nazi Germany.
Step-by-step explanation:
The United States sided with the Allied powers in World War II, which included nations like the United Kingdom, the Soviet Union, and France. Although initially practicing a policy of neutrality, the US was compelled to join the Allies after Japan attacked Pearl Harbor and the subsequent declaration of war by Nazi Germany. The wartime alliance of the US and the Soviet Union was crucial; together with Britain and other allies, they fought against the Axis powers and emerged victorious. It is important to acknowledge that a significant contribution to the defeat of Nazi Germany was made by the Soviet Union, which bore an immense number of casualties and played a pivotal role in the Eastern Front.