Answer:
The Soviet Union has taken control of the countries of Central and Eastern Europe.
Explanation:
Iron Curtain is a historical term that refers to the political, ideological, and in some cases also physical, border between Western Europe (Capitalist Bloc) and Eastern Europe (Communist Bloc), after World War II.
Winston Churchill used it to refer to the border, not only physical but also ideological, which divided Europe into two blocks after the Second World War. Churchill popularized the term at a conference in the United States in 1946, when he said:
"From Stettin, in the Baltic, to Trieste, in the Adriatic, an iron curtain has fallen on the continent."
The frontier of which Churchill spoke divided the socialist states, headed politically, economically and militarily by the Soviet Union, and the capitalist states, aligned with the United States.
