How did british prime minister winston churchill describe the imaginary barrier seperating communist contries from democracies?

He used the term "The Iron Curtain". He used the term in a speech in Fulton Missouri in 1946.

1. the cold war
2. the iron curtain
3. to oppose Soviet expansion and keep communism in check
4. the Marshall plan
5. Berlin Airlift
6. to coordinate military training for the Allies (i think)
7. to develop an Asian ally against communism
8.North Korea invaded South Korea.
9.President Truman fired him for insubordination.
10.North Korea and South Korea remained separate with a demilitarized zone along the 38th parallel.
11.Red Scare
12.a tactic of spreading fear with baseless accusations of communist activities in the United States
13.expected other nations to do their part
14.the power of the military-industrial complex

But if you're looking for  specific answer, then it's the third one, (to oppose Soviet expansion and keep communism in check), Gallatin is supporting universal human rights in America, and is stating that believing that Mexicans are inferior is wrong.