VI History by UVI St Croix Professor - Free for Amazon Prime
Haven't read it. Stumbled upon it while looking for another book.
I think it's free if you have Amazon Prime... I just got it for free.
I just tried it to see. I have Prime and they charged me $20, just like the page said it would be. I returned it, and borrowed for free through the Lending library. Have you accidentally signed up for Kindle Unlimited? I know some people who have done that.