Winston Churchill used which term to describe the division during the Cold War between the East and West?

Winston Churchill used the term "Iron Curtain" to describe the metaphorical division that existed during the Cold War between the communist states of Eastern Europe and the democratic nations of Western Europe. This phrase effectively illustrated the ideological, political, and physical boundaries that separated these two spheres of influence following World War II.

Churchill's use of "Iron Curtain" emphasized the stark differences in governance and societal structure between the two regions, plus it symbolized the lack of communication and cooperation across this divide. The term highlighted the oppressive nature of the regimes in the East, where information and freedom were significantly restricted, contrasting with the more open and free societies in the West.

The other terms listed do not capture the same historical context or significance. The "Berlin Wall," for example, specifically refers to the barrier that physically and ideologically divided Berlin from 1961 to 1989 but was a manifestation of the larger "Iron Curtain" concept. "Cold Front" and "Separation Line" do not convey the same depth of political and ideological division that the "Iron Curtain" represents.