Austin Bay looks back on history for a little perspective on where we are now. His nutshell version of John Lewis Gaddis' recent book (Surprise, Security and the American Experience) is:

1. The Monroe Doctrine
2. FRD's Grand Strategy
3. The Bush Doctrine

The article (registration required) is worthwhile reading. The book sounds like one for my "Must Read" list (or perhaps my musty Amazon wishlist).

(Hat-tip to Patriot Paradox)