This phrase may have been used before, but a speech by former British prime minister to a small Missouri college on March 5, 1946, brought it into popular usage. While the U.S. and Britain were working on their post-World War Two economies, Churchill warned of this -- quote -- "descending across the continent" and dividing Europe. What figurative phrase did Churchill give to the heavily patrolled division between Communist countries in the east and free countries in the west?

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