The use of the word "both", encourages unity between nations (A).
He often referenced the idea of the country coming together to work as a single one throughout his address. He is emphasized the populace that the nation must remain united in the face of even if there is a nuclear war, that all will need to work together to survive. Splitting because of variations in viewpoints and beliefs that don't take into account the big picture will only harm the nation in the long run. Long-term Kennedy worked hard to ensure that the public understands this.
Kennedy employs the term "both" about thirty times in his speech of only nine minutes. The number of times this word is used in comparison to the brief time he was speaking demonstrates how much Kennedy sought to foster and strengthen the audience's cohesion and rapport.
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