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AP Human Geography Question Review 2 - Boundaries

Our second installment into question reviews for AP Human Geo

Continuing with our AP question reviews, this post covers the subject of AP Human Geography. Given that we cover mainly STEM subjects, we felt like it was necessary to continue with our second question review for human geography. This post covers the concept of different types of boundaries. The question is displayed below:

The border between the United States and Canada along the 49th parallel is a good example of what type of boundary?

The answer choices are:

  • Antecedent boundary
  • Superimposed boundary
  • Relic boundary
  • Subsequent boundary
  • Demarcation boundary line

The answer is an antecedent boundary. An antecedent boundary has remained intact despite settlements occurring at a later date. In other words, it was a boundary that was drawn far before an area became heavily populated. For the most part, citizens who settled in the northern portions of the United States realized that to stay in the United States, they needed to settle south of the 49th parallel. Likewise, Canadians stayed to the north of that boundary.

The result is that when the boundary was put on the landscape, the 49th parallel was already a cultural icon, making the selection of the boundary's location an easy decision. Much of the boundary between the United States and Canada is unguarded, and it is the longest undefended border in the world. In many cases, people wouldn't know that they had crossed the border. Checkpoints do exist on several main roads, but for the most part, no fence delineates the border between the two countries.

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