What phrase did President Eisenhower coin to describe the vulnerable neighbors of a country like Vietnam threatened with a Communist takeover?

Name: What phrase did President Eisenhower coin to describe the vulnerable neighbors of a country like Vietnam threatened with a Communist takeover?
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Question

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President Eisenhower coined the term "domino theory" to describe how the fall of one country to communism could lead to the spread of communism to neighboring countries, like a row of dominoes falling over.

What Phrase Did President Eisenhower Coin to Describe the Vulnerable