. Why do you think the US was unsuccessful in Vietnam?

Failure of Operation Rolling Thunder: The bombing campaign failed because the bombs often fell into empty jungle, missing their Vietcong targets. ... The brutal tactics used by US troops often drove more Vietnamese civilians to support the Vietcong.

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answer is b.

  it is always the best policy to have good communication and good relations between individuals and, specially, between leaders of the countries. for this purpose, among others, there is a common place, the united nations, where the representants can present his and learn about the other country's policies.