If there is one thing that I would like to claim as my own, it is the comparative theory of superpower collapse. For now, it remains just a theory, although it is currently being quite thoroughly tested. The theory states that the United States and the Soviet Union will have collapsed for the same reasons, namely: a severe and chronic shortfall in the production of crude oil (that magic addictive elixir of industrial economies), a severe and worsening foreign trade deficit, a runaway military budget, and ballooning foreign debt. I call this particular list of ingredients "The Superpower Collapse Soup." Other factors, such as the inability to provide an acceptable quality of life for its citizens, or a systemically corrupt political system incapable of reform, are certainly not helpful, but they do not automatically lead to collapse, because they do not put the country on a collision course with reality. Please don't be too concerned, though, because, as I mentioned, this is just a theory. My theory.
[h/t to kevin]