Unfortunately, I don't think America is isolated in this case. There is a strong creationist/IDist movement in Germany as well. Possibly even worse because one of the biggest name microbiology professors in Munich is an IDist and he has influence over school text books.
I also doubt that the Bush admin is the first to manipulate, disregard, or lie about scientific results. They are novel in not trying to conceal it (unless you call the retarded propaganda they use concealment). Industry will always have a strong motivation to conceal or deny scientific results if it hurts their profits..look at the tobacco industry. If the admin is in their sphere of influence, it will become a branch of their propaganda/advertising department.
I think the problem is cumulative. An increasingly uninformed public leaves any administration open to do whatever they want without justification or fear of being questioned.
I would have to see the numbers of the total number of US citizens who are achieving advanced degrees in science over several decades before I would conclude that there has been such a tectonic shift in the US...or a dramatic decrease in scientific competitiveness...if this starts to appear over the next decade then your sci-fi novels plot may come to pass.