Both countries were trying to colonize the Americas and they fought over land
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what's the picture? if you put it on, I'll know what to say
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The correct answer is A. The fact that communism was spreading and threatening government stability began to shape the debate over foreign policy in the 1960s. This situation led to the development of the domino theory and the adoption of the Johnson Doctrine as the main foreign policy rule in the United States.
The doctrine meant that the United States of America appropriated the right to carry out armed intervention in the internal affairs of the states of the Western Hemisphere (and subsequently of any countries in the Asia-Pacific region) to protect the interests of its citizens. The doctrine was aimed at preventing the coming to power of communist or socialist parties (even if their coming was done in a democratic way and with the support of the majority of the population of a sovereign country).
The foreign policy issue that was a motivation for American intervention in Vietnam was the idea of "containment" which sought to contain communist expansion where it was, as opposed to attempting to eradicate it at the source.
