I just got the contract to do a second edition of It Happened in Missouri. This is a collection of 30 tales of the Show-Me State, everything from how a 14 year-old boy founded St. Louis to Jesse James' first train robbery.
This title has been selling pretty well. Lots of libraries and schools have picked it up. State history tends to be popular, at least in that state. Most purchases are either orders from institutions or bought from the local interest sections of bookshops. Thus the Amazon rankings for state histories tend to be low. Amazon rankings are usually a poor way to gauge the popularity of a book.
Anyway, my deadline isn't until the end of 2012 so this new edition won't be out until 2013. It will include two new tales and perhaps some other goodies me and my editor will cook up.
for more insights about writing history for fun and profit, check out my article: How to Break into the Burgeoning History Market.