What does the use of Paul Revere's phrase-"One if by land; two if by sea"-mean in the context of a discussion of the earliest human settlement of the New World?

Name: What does the use of Paul Revere's phrase-"One if by land; two if by sea"-mean in the context of a discussion of the earliest human settlement of the New World?
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The Answer of What does the use of Paul Revere's phrase-"One if by land; two if by sea"-mean in the context of a discussion of the earliest human settlement of the New World?

What Does the Use of Paul Revere's Phrase-"One If by Land;