During which major conflict was the term "Iron Curtain" notably used?

The term "Iron Curtain" was notably used during the Cold War to describe the ideological and physical boundary that separated Western Europe from the Eastern bloc. This phrase was popularized by Winston Churchill in a famous speech delivered in 1946, where he referred to the "Iron Curtain" descending across Europe, symbolizing the division between the democratic nations of the West and the communist states of the East.

This period was characterized by significant political tension, military alliances, and socio-economic differences between the two areas. The Iron Curtain metaphor captured the essence of the divide that existed due to differing political ideologies and the resulting conflicts that emerged, including proxy wars and a nuclear arms race. The other conflicts mentioned may have involved significant geopolitical tensions, but they did not center around the specific ideological divide that defined the Cold War era.