Answer:
Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, Romania.
Step-by-step explanation:
The nations listed were Eastern European nations that were part of the Warsaw Pact that was signed with the Soviet Union in 1955. The name stems from the facts that the agreement was signed in Warsaw, Poland. Albania also was an original signer of the Warsaw Pact, but split its relationship with the Soviet Union some years later.
Prior to the end of World War II, British Prime Minister Winston Churchill and US President Franklin Roosevelt pushed strongly for Soviet leader Josef Stalin to allow free elections to take place in the nations of Europe after the war. Stalin had stated agreement with his fellow Allied leaders. But after the war ended, Stalin and the Soviets never did allow those free elections to occur. The Soviets felt they needed the Eastern European nations as satellites to protect their own interests. A line of countries in Eastern Europe came into line with the USSR and communism -- thus called "satellites."