All of the above is the correct answer.
The United States assumed that since the USSR was attempting to spread communism into Asia, countries around the main target would fall as well - the Domino Effect.
The United States fought to prevent the spread of communism by interfering in countries such as Vietnam and Korea - however, both outcomes were unsuccessful or did little to nothing.
Yes, they were correct as once Vietnam fell to communism so did Cambodia and Laos.
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Answer:
Hiroshima was destroyed
Explanation:
An atomic bomb has major radiation effects, so people and buildings that did survive the bomb may not have survived the radiation following the bomb.