I have "For Want of a Nail" on my desk again. I think I am finally ready to read it.
This alternate history textbook written by Professor Robert Sobel in 1971 posits that America lost the American Revolution. Sobel outlines the history of North America from 1763 to 1971. The book is a work of fiction, but is presented as an undergraduate history textbook, complete with over 800 footnotes to non-existent books and articles. Detailed and well-written, this book has become a type of shrine for alternate history fans.