Read the quote from NATO’s first Secretary General. [Our goal] is to keep the Russians out, the Americans in, and the Germans down. According to the quote, NATO's goal is to

The quote describes NATO’s goal as keeping the Russians “out,” meaning preventing Soviet or Russian influence from dominating Europe. Keeping the Americans “in” refers to continued U.S. involvement in European security, while keeping the Germans “down” reflects concern about a renewed German military threat. Therefore, the best answer is “keep the Russians from taking over Europe.”

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