For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
I was reading Isaiah Chapter 18 last night and I felt prompted to research this chapter. Funny that it would be a question today. When I researched this chapter it brought forth many many articles on the United States. To best share this information, please read this chapter (Isaiah 18) and research it for yourself. It will give great insight into prophetic writings on America's biblical position.
The book "The Harbingers" although Christian fiction was very interesting and touched on this very thing. A very good read.