What was the name of the theory that said that if one country in a region fell to communism, others would surely follow?
domino theory
arms race
brinkmanship
containment theory
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The right answer is:  domino theory.

Explanation:

The domino theory was seen as a likely outcome in the geopolitical chess of the Cold War in the developing world. According to the views and mentality of the era, if one country falls to Communist hands, neighbors will follow. It was a rationale for action in both Korea and Vietnam. It was also applied to Latin America.

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the steamboat is your answer.

it seems like its the only form of transportation on the choices.