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What is the Canada/USA border referred to as?

  1. The Friendly Line

  2. The Great Divide

  3. The Peaceful Edge

  4. The world's longest undefended border

The correct answer is: The world's longest undefended border

This border is known as the world's longest undefended border because it is the border between Canada and the United States, and it is the longest international border without military forces guarding it. The options A, B and C might be desirable names and could be used for the border, but they are not the official or commonly used names.