I read it a few years back. It provides pretty detailed and interesting explanations for naming certain cultural regions and drawing divisions the way they are. But even in '81, and especially now, there are a lot more aberrations than Garreau sees fit to point out. Myself, and others, have highlighted some of these unacknowledged aberrations elsewhere in the thread. Some aberrations might be large enough to even designate new "Nations". But for someone living outside the US, or anyone else unfamiliar with the general cultural differences and boundaries within the US, the book would still be worth reading and learning from even today, even if it paints in broad strokes.