Who first used the term iron curtion in 1946?

The term "iron curtain" was first popularized by British Prime Minister Winston Churchill in a speech he delivered on March 5, 1946, at Westminster College in Fulton, Missouri. In this speech, he used the term to describe the divide between Western democracies and Eastern communist countries following World War II. Churchill's phrase symbolized the ideological and political barrier that separated the two spheres during the Cold War.