In 1945, Soviet troops pushed Nazi armies out of Europe, setting up pro-soviet “satellite governments” in these nations. During this, this metaphor is established.
Iron Curtain
The metaphor you are referring to is the “Iron Curtain.” It was first used by former British Prime Minister Winston Churchill in a speech he delivered in Fulton, Missouri on March 5, 1946. Churchill used this term to describe the division of Europe between the Western capitalist countries, led by the United States, and the Eastern communist countries, led by the Soviet Union. The Iron Curtain was symbolic of the physical and ideological divide between the two global powers, which had vastly different visions for the post-World War II world. The Iron Curtain metaphorically represented the Cold War and the ideological divide between communism and democracy. It lasted until the collapse of the Soviet Union in 1991, marking the end of the Cold War.
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The Iron Curtain:Understanding the Division of Germany into East and West Controlled Territories