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The domino theory was used by the United States as a justification for A. participating in the Vietnam War (1960's-1970's) B. extending diplomatic recognition to the People's Republic of China (1979) C. negotiating with Iran to release American hostages (1979-1980) O D. sending armed forces to the Middle East (1990-1991)

User Naortor
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Answer:

A. participating in the Vietnam War (1960's-1970's)

Step-by-step explanation:

User Alex Bonel
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