There's this company that I found called
Hourly History Ltd.. Their focus is on "publishing history books that are concise, straightforward and take no longer than one hour to read."
The company seems to differ from the gazillions of re-publishers that are out there in the fact that these books appear to be written by people in recent times. They also differ in that they publish what their theme says:
concise history books.
They currently have a couple of dozen or so
free ebooks at Amazon. If you'd like to check into them, go to
this webpage. When I did the search, all of the ebooks on the first page happened to be
free and all of those beginning with the first one on the second page were not free.
If you like what you see, and would like to keep informed by Hourly History of whatever that they want to inform you of, follow
this link and sign up for their emails. The webpage doesn't mention it, but if you do that, they will send you a
free copy (PDF) of
British History in 50 Events, by Henry Freeman. It's formatted more like a research paper than an ebook, but perhaps you will find it helpful.