Answer:
The Soviet Union has taken control of the countries of Central and Eastern Europe.
Step-by-step explanation:
When Churchill adresses this speech, the soviet union has already make a strong influence in central and eastern countries of europe, making stronger the Union of Soviet Socialist Republics and adding up more and more territory and nations to the Union. The iron curtain makes the reference to a comerce or a country that is closed to trades and exhanges with their neighbors, the nations that got anexed to the USSR were immidiately separated from the western world.