USA HISTORY

Detailed explanation-1: -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. More generally, the Allies included all the wartime members of the United…

Detailed explanation-2: -Signed on May 14, 1955, the Warsaw Pact established the Warsaw Treaty Organization, a mutual defense alliance that was originally composed of the Soviet Union, Albania, Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, and Romania.

Detailed explanation-3: -On September 27, 1940, Germany, Italy, and Japan signed the Tripartite Pact. This pact formalized the alliance between the three countries, which subsequently were referred to as the Axis powers.

Detailed explanation-4: -The Soviet Union, which initially had a nonaggression pact with Germany and participated in its invasion of Poland, joined the Allies in June 1941 after Operation Barbarossa, the German invasion of the Soviet Union.

Detailed explanation-5: -Answer and Explanation: The Soviet Union joined the Allies after the Nazis invaded the Soviet Union with Operation Barbarossa in 1941. Hitler launched an invasion in the summer of 1941 to conquer the Soviet Union and prompted Stalin to declare war on Germany and align himself with the Allies.