USA HISTORY

Detailed explanation-1: -In World War II, the three great Allied powers-Great Britain, the United States, and the Soviet Union-formed a Grand Alliance that was the key to victory. But the alliance partners did not share common political aims, and did not always agree on how the war should be fought.

Detailed explanation-2: -World War II the chief Allied powers were Great Britain, France (except during the German occupation, 1940–44), the Soviet Union (after its entry in June 1941), the United States (after its entry on December 8, 1941), and China.

Detailed explanation-3: -The Allies, formally referred to as the United Nations from 1942, were an international military coalition formed during the Second World War (1939–1945) to oppose the Axis powers, led by Nazi Germany, Imperial Japan, and Fascist Italy.

Detailed explanation-4: -The alliance between the United States and the Soviet Union during World War II developed out of necessity, and out of a shared realization that each country needed the other to defeat one of the most dangerous and destructive forces of the twentieth century.