"Why do you think … ?"
Clearly your teacher wants to know what YOU think, but if you post your answer to this question, someone here should be able to critique it for you.
Why do you think Americans were so fascinated by this idea of the United States stretching from “sea to sea”?
2 answers
The writeacher is right. He has a point they can critique you. Just answer the question its on the book. I was here because I was desperate, at least try to do it yourself.