I read cozy and historical mysteries, a bit of Paranormal/UF, and to mix it up, I read science and gardening books on occasion.
I'd say this is a perfect book for teens, as a hook to get them interested in history, but the casual use of colourful language disqualifies this book for any educational purposes, never mind the section on the Newport Sex Scandal.
So it's definitely aimed at adults, but the adults reading it would best enjoy it fi they picked it up for the humor, because while the anecdotes are factual, the subjects and tone are best enjoyed by someone looking for quirky good fun.
With this in mind, I enjoyed the book; it was a humorous, quick read and I learned a few things (I had no idea we had a straw hat riot). But I'd like to declare the whole 'how lobotomies became a thing' story as definitely NOT untold. I've read about Freeman several times in the last few years, so I think it's safe to say that cat is out of the bag.
I did skip the last section completely (the last 14 pages), except for the last story concerning the Kentucky meat shower; it covers, best I can tell from that sections introduction, stories of absurd things we've done to/with animals. I'm not even going there. (Although the Kentucky meat thing had a pretty funny, and totally natural, if unbelievable, explanation.)