Answer :
The President Eisenhower speech on the War in 1954 was influenced by the Domino Theory. So, the first choice is the right one.
What was the theory of domino?
The "domino theory," a Cold War tactic, held that a communist rule in one nation would quickly lead to communist takeovers in neighboring ones, each falling like a tidy row of dominoes.
The Domino Theory had an impact on President Eisenhower's 1954 speech on the War. Therefore, the first option is the best one.
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